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Mustafa, E., Tahira, A., Adam, R. E., Ibupoto, Z. H., Elhag, S., Willander, M. & Nur, O. (2019). Efficient Ni–Fe layered double hydroxides/ZnO nanostructures for photochemical water splitting. Journal of Solid State Chemistry, 273, 186-191
Open this publication in new window or tab >>Efficient Ni–Fe layered double hydroxides/ZnO nanostructures for photochemical water splitting
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2019 (English)In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 273, p. 186-191Article in journal (Refereed) Published
Abstract [en]

Zinc oxide (ZnO) nanostructures are widely investigated for photocatalytic applications but the functional properties are limited by the fast carrier recombination rate, which is an intrinsic property of ZnO. To optimize the recombination rate of ZnO, a study is carried out in which it is covered with Ni-Fe layered double hydroxides and synergistic effects are created which boosted the photocatalytic activity of ZnO. The nanostructured materials are synthesized by the low temperature aqueous chemical growth and electrodeposition methods. These nanostructures are characterized by scanning electron microscopy (SEM) and powder X-ray diffraction (XRD) technique. SEM study has revealed a Ni–Fe LDH coated ZnO NRs. The powder XRD has showed a cubic phase of the Ni-Fe layered double hydroxide on the ZnO NRs having an excellent crystalline quality. The optical characterization has shown low scattering of light for the Ni–Fe LDH coated ZnO NRs sample. The sample prepared with deposition time of 25 s showed excellent photochemical water splitting properties compared to counter photo-anodes in alkaline media. The photo response was highly stable and fast. The incident photon to current conversion efficiency for the photo-anode of Ni–Fe(LDHs)/ZnO over 25 s was 82% at a maximum absorption of 380 nm compared to the pristine ZnO NRs which has 70% at the same wavelength. This study is providing a simple, cost effective, earth abundant and environment friendly methodology for the fabrication of photo-anodes for diverse applications specifically water oxidation and solar radiation driven water splitting.

Place, publisher, year, edition, pages
Academic Press, 2019
Keywords
ZnO nanorods, Ni–Fe layered double hydroxides, Photochemical water splitting
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-155658 (URN)10.1016/j.jssc.2019.03.004 (DOI)000466261100027 ()2-s2.0-85062437722 (Scopus ID)
Note

Funding agencies:  department of Science and Technology, Campus Norrkoping, Linkoping University, Sweden

Available from: 2019-03-22 Created: 2019-03-22 Last updated: 2019-06-22Bibliographically approved
Adam, R. E., Chalangar, E., Pirhashemi, M., Pozina, G., Liu, X., Palisaitis, J., . . . Nur, O. (2019). Graphene-based plasmonic nanocomposites for highly enhanced solar-driven photocatalytic activities. RSC Advances, 9(52), 30585-30598
Open this publication in new window or tab >>Graphene-based plasmonic nanocomposites for highly enhanced solar-driven photocatalytic activities
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2019 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 9, no 52, p. 30585-30598Article in journal (Refereed) Published
Abstract [en]

High-efficiency photocatalysts are crucial for the removal of organic pollutants and environmental sustainability. In the present work, we report on a new low-temperature hydrothermal chemical method, assisted by ultrasonication, to synthesize disruptive plasmonic ZnO/graphene/Ag/AgI nanocomposites for solar-driven photocatalysis. The plasmonic nanocomposites were investigated by a wide range of characterization techniques, confirming successful formation of photocatalysts with excellent degradation efficiency. Using Congo red as a model dye molecule, our experimental results demonstrated a photocatalytic reactivity exceeding 90% efficiency after one hour simulated solar irradiation. The significantly enhanced degradation efficiency is attributed to improved electronic properties of the nanocomposites by hybridization of the graphene and to the addition of Ag/AgI which generates a strong surface plasmon resonance effect in the metallic silver further improving the photocatalytic activity and stability under solar irradiation. Scavenger experiments suggest that superoxide and hydroxyl radicals are responsible for the photodegradation of Congo red. Our findings are important for the fundamental understanding of the photocatalytic mechanism of ZnO/graphene/Ag/AgI nanocomposites and can lead to further development of novel efficient photocatalyst materials.

Place, publisher, year, edition, pages
Royal Meteorological Society, 2019
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:liu:diva-160568 (URN)10.1039/C9RA06273D (DOI)
Available from: 2019-09-30 Created: 2019-09-30 Last updated: 2019-10-07Bibliographically approved
Pirhashemi, M., Elhag, S., Elhadi Adam, R., Habibi-Yangjeh, A., Liu, X., Willander, M. & Nur, O. (2019). n–n ZnO–Ag2CrO4 heterojunction photoelectrodes with enhanced visible-light photoelectrochemical properties. RSC Advances, 9(14), 7992-8001
Open this publication in new window or tab >>n–n ZnO–Ag2CrO4 heterojunction photoelectrodes with enhanced visible-light photoelectrochemical properties
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2019 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 9, no 14, p. 7992-8001Article in journal (Refereed) Published
Abstract [en]

In this study, ZnO nanorods (NRs) were hydrothermally grown on an Au-coated glass substrate at a relatively low temperature (90 °C), followed by the deposition of Ag2CrO4 particles via a successive ionic layer adsorption and reaction (SILAR) route. The content of the Ag2CrO4 particles on ZnO NRs was controlled by changing the number of SILAR cycles. The fabricated ZnO–Ag2CrO4 heterojunction photoelectrodes were subjected to morphological, structural, compositional, and optical property analyses; their photoelectrochemical (PEC) properties were investigated under simulated solar light illumination. The photocurrent responses confirmed that the ability of the ZnO–Ag2CrO4 heterojunction photoelectrodes to separate the photo-generated electron–hole pairs is stronger than that of bare ZnO NRs. Impressively, the maximum photocurrent density of about 2.51 mA cm−2 at 1.23 V (vs. Ag/AgCl) was measured for the prepared ZnO–Ag2CrO4 photoelectrode with 8 SILAR cycles (denoted as ZnO–Ag2CrO4-8), which exhibited about 3-fold photo-enhancement in the current density as compared to bare ZnO NRs (0.87 mA cm−2) under similar conditions. The improvement in photoactivity was attributed to the ideal band gap and high absorption coefficient of the Ag2CrO4 particles, which resulted in improved solar light absorption properties. Furthermore, an appropriate annealing treatment was proven to be an efficient process to increase the crystallinity of Ag2CrO4 particles deposited on ZnO NRs, which improved the charge transport characteristics of the ZnO–Ag2CrO4-8 photoelectrode annealed at 200 °C and increased the performance of the photoelectrode. The results achieved in the present work present new insights for designing n–n heterojunction photoelectrodes for efficient and cost-effective PEC applications and solar-to-fuel energ

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-155657 (URN)10.1039/C9RA00639G (DOI)000462646000051 ()2-s2.0-85062919263 (Scopus ID)
Note

Funding agencies: University of Mohaghegh Ardabili-Iran and Linkoping University-Sweden; AForsk [17-457

Available from: 2019-03-22 Created: 2019-03-22 Last updated: 2019-04-18Bibliographically approved
David, D., Alnoor, H., Mancir da Silva Santana, V., Bargiela, P., Nur, O., Willander, M., . . . Ferreira da Silva, A. (2019). Optical properties from photoelectron energy-loss spectroscopy of low-temperature aqueous chemically synthesized ZnO nanorods grown on Si. Semiconductor Science and Technology, 34(4), Article ID 045019.
Open this publication in new window or tab >>Optical properties from photoelectron energy-loss spectroscopy of low-temperature aqueous chemically synthesized ZnO nanorods grown on Si
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2019 (English)In: Semiconductor Science and Technology, ISSN 0268-1242, E-ISSN 1361-6641, Vol. 34, no 4, article id 045019Article in journal (Refereed) Published
Abstract [en]

The optical properties of zinc oxide (ZnO) nanorods (NRs) synthesized by the low-temperature aqueous chemical method on top of silicon (Si) substrate have been investigated by means of photoelectron energy loss spectroscopy (PEELS). The ZnO NRs were obtained by the low temperature aqueous chemical synthesis on top of Si substrate. The measured valence band, the dynamical dielectric functions and optical absorption of the material show a reasonable agreement when the trending and shape of the theoretical calculations are considered. A first-principle calculation based on density functional theory (DFT) was performed using the partially self-consistent GW approximation (scGW0) and compared to the experimental results. The application of these two techniques brings a new analysis of the electronic properties of this material. The experimental results regarding the density of states (DOS) obtained for the valence band using x-ray photoelectron spectroscopy (XPS) was found to be consistent with the theoretical calculated value. Due to this consistency, the same wavefunctions was then employed to calculate the dielectric function of the ZnO NRs. The experimentally extracted dielectric function was also consistent with the calculated values.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
Keywords
ZnO nanorods; optical properties; density of states; dielectric function; density functional theory
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-155654 (URN)10.1088/1361-6641/ab0bc4 (DOI)000461940800007 ()
Note

Funding agencies: National Research Council of Scientific and Technological Development (CNP); Bahia Research Foundation (FAPESB)/PRONEX; CAPES Foundation within the Ministry of Education, Research Council of Norway [243642]

Available from: 2019-03-22 Created: 2019-03-22 Last updated: 2019-04-03Bibliographically approved
Elhadi Adam, R., Mustafa, E., Elhag, S., Nur, O. & Willander, M. (2019). Photocatalytic properties for different metal-oxide nanomaterials. In: Oxide-based Materials and Devices X: . Paper presented at SPIE OPTO, February 2-7 2019, San Francisco, California, United States. SPIE, Article ID 1091925.
Open this publication in new window or tab >>Photocatalytic properties for different metal-oxide nanomaterials
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2019 (English)In: Oxide-based Materials and Devices X, SPIE , 2019, article id 1091925Conference paper, Published paper (Refereed)
Abstract [en]

We here demonstrate the synthesis of different nanostructures, including nanoparticles, nanorods, core-shell structures,and compound metal oxide nanostructures all synthesized by a low temperature chemical process. We furtherinvestigated their photocatalytic properties for degradation of toxic waste and their photochemical efficiency for watersplitting. All the photocatalytic properties as well as the photochemical properties were utilized using sun radiation. Theresults presented indicate huge potential for the investigated processes with positive impact to energy consumption andbenefits for the environment.

Place, publisher, year, edition, pages
SPIE, 2019
Series
Proceedings of SPIE, ISSN 0277-786X, E-ISSN 1996-756X ; 10919
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-155664 (URN)10.1117/12.2517436 (DOI)000485015600006 ()
Conference
SPIE OPTO, February 2-7 2019, San Francisco, California, United States
Note

Funding agencies: Knut and Alice Wallenberg foundation (KAW), through a Wallenberg Scholar grant; China Scholarship CouncilChina Scholarship Council

Available from: 2019-03-22 Created: 2019-03-22 Last updated: 2019-09-30
Elhadi Adam, R., Pirhashemi, M., Elhag, S., Liu, X., Habibi-Yangjeh, A., Willander, M. & Nur, O. (2019). ZnO/Ag/Ag2WO4 photo-electrodes with plasmonic behavior for enhanced photoelectrochemical water oxidation. RSC Advances, 9(15), 8271-8279
Open this publication in new window or tab >>ZnO/Ag/Ag2WO4 photo-electrodes with plasmonic behavior for enhanced photoelectrochemical water oxidation
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2019 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 9, no 15, p. 8271-8279Article in journal (Refereed) Published
Abstract [en]

Ag-based compounds are excellent co-catalyst that can enhance harvesting visible light and increase photo-generated charge carrier separation owing to its surface plasmon resonance (SPR) effect in photoelectrochemical (PEC) applications. However, the PEC performance of a ZnO/Ag/Ag2WO4 heterostructure with SPR behavior has not been fully studied so far. Here we report the preparation of a ZnO/Ag/Ag2WO4 photo-electrode with SPR behavior by a low temperature hydrothermal chemical growth method followed by a successive ionic layer adsorption and reaction (SILAR) method. The properties of the prepared samples were investigated by different characterization techniques, which confirm that Ag/Ag2WO4 was deposited on the ZnO NRs. The Ag2WO4/Ag/ZnO photo-electrode showed an enhancement in PEC performance compared to bare ZnO NRs. The observed enhancement is attributed to the red shift of the optical absorption spectrum of the Ag2WO4/Ag/ZnO to the visible region (>400 nm) and to the SPR effect of surface metallic silver (Ag0) particles from the Ag/Ag2WO4 that could generate electron–hole pairs under illumination of low energy visible sun light. Finally, we proposed the PEC mechanism of the Ag2WO4/Ag/ZnO photo-electrode with an energy band structure and possible electron–hole separation and transportation in the ZnO/Ag/Ag2WO4 heterostructure with SPR effect for water oxidation. ER

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-155655 (URN)10.1039/C8RA10141H (DOI)000461445300016 ()
Available from: 2019-03-22 Created: 2019-03-22 Last updated: 2019-04-08Bibliographically approved
Wahab, H. A., Salama, A. A., El Saeid, A. A., Willander, M., Nour, O. & Battisha, I. K. (2018). Zinc oxide nano-rods based glucose biosensor devices fabrication. RESULTS IN PHYSICS, 9, 809-814
Open this publication in new window or tab >>Zinc oxide nano-rods based glucose biosensor devices fabrication
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2018 (English)In: RESULTS IN PHYSICS, ISSN 2211-3797, Vol. 9, p. 809-814Article in journal (Refereed) Published
Abstract [en]

ZnO is distinguished multifunctional material that has wide applications in biochemical sensor devices. For extracellular measurements, Zinc oxide nano-rods will be deposited on conducting plastic substrate with annealing temperature 150 degrees C (ZNRP150) and silver wire with annealing temperature 250 degrees C (ZN(R)W250), for the extracellular glucose concentration determination with functionalized ZN(R)-coated biosensors. It was performed in phosphate buffer saline (PBS) over the range from 1 mu M to 10 mM and on human blood plasma. The prepared samples crystal structure and surface morphologies were characterized by XRD and field emission scanning electron microscope FESEM respectively. (C) 2018 The Authors. Published by Elsevier B.V.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2018
Keywords
ZN(R)P150; ZN(R)W250; Sol-Gel; Glucose biosensors; Blood plasma
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:liu:diva-149734 (URN)10.1016/j.rinp.2018.02.077 (DOI)000435611100108 ()
Note

Funding Agencies|Science and Technology Development Fund (STDF) project [5368]

Available from: 2018-07-24 Created: 2018-07-24 Last updated: 2018-08-14
Azahar Ali, M., Srivastava, S., Agrawal, V. V., Willander, M., John, R. & Malhotra, B. D. (2016). A biofunctionalized quantum dot-nickel oxide nanorod based smart platform for lipid detection. Journal of materials chemistry. B, 4(15), 2706-2714
Open this publication in new window or tab >>A biofunctionalized quantum dot-nickel oxide nanorod based smart platform for lipid detection
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2016 (English)In: Journal of materials chemistry. B, ISSN 2050-750X, E-ISSN 2050-7518, Vol. 4, no 15, p. 2706-2714Article in journal (Refereed) Published
Abstract [en]

A reagent-free, low-cost and sensitive immunosensor has been fabricated using anti-apolipoprotein B (AAB) conjugated L-cysteine in situ capped cadmium sulfide quantum dots (CysCdS QDs) bound to nickel oxide nanorods (nNiO) for detection of low density lipoprotein (LDL) molecules in human serum samples. The structural and morphological properties of AAB conjugated CysCdS QDs and nNiO have been investigated using electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy and UV-visible techniques. In this immunosensor, the synthesized NiO nanorods act as mediators that allow the direct electron transfer due to their channeling effect resulting in a mediator-free biosensor. This mediator-free CysCdS-NiO based immunosensor shows improved characteristics such as a good sensitivity of 32.08 mu A (mg dl(-1))(-1) cm(-2) compared to that based on nNiO (1.42 mA (mg dl(-1))(-1) cm(-2)) alone for detection of lipid (LDL) molecules over a wide concentration range, 5-120 mg dl(-1) (0.015-0.36 mu M). The kinetic analysis yields an association constant (K-a) of 3.24 kM(-1) s(-1), indicating that the antibody conjugated CysCdS-NiO platform has a strong affinity towards lipid molecules. The excellent electron transport properties of the CysCdS-NiO nanocomposite in this immunosensor reveal that it provides an efficient platform for routine quantification of LDL molecules in real samples.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2016
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-127759 (URN)10.1039/c5tb02578h (DOI)000374098800021 ()
Note

Funding Agencies|Department of Science and Technology, India [DST/TSG/ME/2008/18]; CSIR

Available from: 2016-05-12 Created: 2016-05-12 Last updated: 2017-11-30
Ali Soomro, R., Richard Hallam, K., Hussain Ibupoto, Z., Tahira, A., Tufail Hussain Sherazi, S., Sanam Sirajjuddin; Memon, S. & Willander, M. (2016). Amino acid assisted growth of CuO nanostructures and their potential application in electrochemical sensing of organophosphate pesticide. Electrochimica Acta, 190, 972-979
Open this publication in new window or tab >>Amino acid assisted growth of CuO nanostructures and their potential application in electrochemical sensing of organophosphate pesticide
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2016 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 190, p. 972-979Article in journal (Refereed) Published
Abstract [en]

This work reports a highly sensitive electrochemical sensor for organophosphate pesticide (malathion) based on unique and attractive CuO nanostructures. The discussed nanostructures were synthesized using low temperature hydrothermal growth method utilizing green amino acids such as glycine, serine, threonine and histidine as effective bio-compatible templates. The morphological evaluation demonstrated formation of unique and attractive 1-D nanostructures reflecting the effective growth controlling and directing capabilities of the utilized amino acids. The as-synthesized CuO nanostructures were noted to possess high affinity towards malathion which enabled their application as electrode material for the development of affinity based electrochemical sensor. Although, the as-synthesized morphologies were all sensitive towards malathion but the glycine directed triangular flake-like nanostructures exhibited greater sensitivity compared to other competitors. The electrochemical behaviour of the modified electrodes was studied using cyclic voltammetry (CV) whereas, differential pulse voltammetry (DPV) was utilized for the analytical evaluation of the sensor. The developed sensor demonstrated high reproducibility, stability, wide detection window (1-12 nM), and sensitivity to detect malathion up to 0.1 nM based on suppressive signal measurement. In addition, the sensor system exhibited high anti-interference capability in the presence of common co-existing pesticides like lindane, carbendazim, and trichlorfon. The developed sensor provides an effective measure for detecting extremely low concentration of malathion with wide applicability in various fields. (C) 2015 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2016
Keywords
Amino acids; CuO nanostructures; Malathion; Organophosphate pesticides
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-126845 (URN)10.1016/j.electacta.2015.12.165 (DOI)000371141500117 ()
Note

Funding Agencies|Higher Education Commission, Islamabad, Pakistan under IRSIP program

Available from: 2016-04-05 Created: 2016-04-05 Last updated: 2017-11-30
Tahira, A., Nafady, A., Baloach, Q., Tufail Hussain Sirajuddin; Sherazi, S., Shaikh, T., Arain, M., . . . Hussain Ibupoto, Z. (2016). Ascorbic Acid Assisted Synthesis of Cobalt Oxide Nanostructures, Their Electrochemical Sensing Application for the Sensitive Determination of Hydrazine. Journal of Electronic Materials, 45(7), 3695-3701
Open this publication in new window or tab >>Ascorbic Acid Assisted Synthesis of Cobalt Oxide Nanostructures, Their Electrochemical Sensing Application for the Sensitive Determination of Hydrazine
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2016 (English)In: Journal of Electronic Materials, ISSN 0361-5235, E-ISSN 1543-186X, Vol. 45, no 7, p. 3695-3701Article in journal (Refereed) Published
Abstract [en]

This study describes, the synthesis of cobalt oxide nanostructures using ascorbic acid as a growth directing agent by the hydrothermal method. Ascorbic acid is used for the first time for the synthesis of cobalt oxide nanostructures and a unique morphology is prepared in the present study. The cobalt oxide nanostructures were characterized by scanning electron microcopy, x-ray diffraction, and x-ray photoelectron spectroscopy techniques. These analytical techniques demonstrated well defined morphology, good crystalline quality, and high purity of as prepared cobalt oxide nanostructures. The glassy carbon electrode was modified with cobalt oxide nanostructures for the development of a sensitive and selective electrochemical hydrazine sensor. The developed hydrazine sensor exhibits a linear range of 2-24 mu M. The sensitivity and limit of detection of presented hydrazine sensors are 12,734 mu A/mM/cm(2) and 0.1 mu M respectively. The developed hydrazine sensor is highly selective, stable, and reproducible. The proposed sensor is successfully applied for the detection of hydrazine from different water samples. The present study provides the development of an alternative tool for the reliable monitoring of hydrazine from environmental and biological samples.

Place, publisher, year, edition, pages
SPRINGER, 2016
Keywords
Cobalt oxide nanostructures; ascorbic acid; hydrazine sensor; cyclic voltammetry; amperometric technique
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-130058 (URN)10.1007/s11664-016-4547-9 (DOI)000377434100058 ()
Note

Funding Agencies|Scientific Research Institute at King Saud University through their Research Group Project [RGP-VPP-236]

Available from: 2016-07-06 Created: 2016-07-06 Last updated: 2017-11-28
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ORCID iD: ORCID iD iconorcid.org/0000-0001-6235-7038

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