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Alghamdi, H. M., Abutalib, M. M., Rajeh, A., Mannaa, M. A., Nur, O. & Abdelrazek, E. M. (2022). Effect of the Fe2O3/TiO2 Nanoparticles on the Structural, Mechanical, Electrical Properties and Antibacterial Activity of the Biodegradable Chitosan/Polyvinyl Alcohol Blend for Food Packaging. Journal of Polymers and the Environment, 30, 3865-3874
Open this publication in new window or tab >>Effect of the Fe2O3/TiO2 Nanoparticles on the Structural, Mechanical, Electrical Properties and Antibacterial Activity of the Biodegradable Chitosan/Polyvinyl Alcohol Blend for Food Packaging
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2022 (English)In: Journal of Polymers and the Environment, ISSN 1566-2543, E-ISSN 1572-8919, Vol. 30, p. 3865-3874Article in journal (Refereed) Published
Abstract [en]

As the request for ready-made food grows, its more important than ever to develop effective antimicrobial food packaging materials to assure foods microbiological safety. The solvent casting method was used to create a chitosan (Cs)/polyvinyl alcohol (PVA) blend based active food packaging material enhanced with Fe2O3/TiO2 (FeTiO2) nanoparticles. The prepared films were characterized by TEM, XRD, FTIR, and ac conductivity. The structural alterations occurring in the nanocomposites are indicated by FTIR spectra and XRD investigations. The AC conductivity and dielectric characteristics of nanocomposites were dramatically improved as the nanoparticle loading was raised. The mechanical properties of blend/FeTiO2 nanocomposites films were better than pure blend film. The nanocomposites films had good antibacterial activity and mechanical properties, suggesting that they could be a viable alternative to non-biodegradable packaging material.

Place, publisher, year, edition, pages
SPRINGER, 2022
Keywords
Preparation of Fe2O3; TiO2; Cs; PVA-FeTiO2 nanocomposites; TEM; Mechanical properties; AC conductivity; Antimicrobial activity
National Category
Polymer Technologies
Identifiers
urn:nbn:se:liu:diva-186164 (URN)10.1007/s10924-022-02478-2 (DOI)000805467000001 ()
Note

Funding Agencies|University of Jeddah, Jeddah, Saudi Arabia [UJ-21-ICI-12]

Available from: 2022-06-22 Created: 2022-06-22 Last updated: 2023-10-12Bibliographically approved
Razmi, N., Hasanzadeh, M., Willander, M. & Nur, O. (2022). Electrochemical genosensor based on gold nanostars for the detection of Escherichia coli O157:H7 DNA. Analytical Methods, 14(16), 1562-1570
Open this publication in new window or tab >>Electrochemical genosensor based on gold nanostars for the detection of Escherichia coli O157:H7 DNA
2022 (English)In: Analytical Methods, ISSN 1759-9660, E-ISSN 1759-9679, Vol. 14, no 16, p. 1562-1570Article in journal (Refereed) Published
Abstract [en]

Escherichia coli O157:H7 (E. coli O157:H7) is an enterohemorrhagic E. coli (EHEC), which has been issued as a major threat to public health worldwide due to fatal contamination of water and food. Thus, its rapid and accurate detection has tremendous importance in environmental monitoring and human health. In this regard, we report a simple and sensitive electrochemical DNA biosensor by targeting Z3276 as a genetic marker in river water. The surface of the designed gold electrode was functionalized with gold nanostars and an aminated specific sensing probe of E. coli O157:H7 to fabricate the genosensor. Cyclic voltammetry (CV) and square wave voltammetry (SWV) techniques were applied for electrochemical characterization and detection. The synthesized gold nanostars were characterized using different characterization techniques. The fabricated DNA-based sensor exhibited a high selective ability for one, two, and three-base mismatched sequences. Regeneration, stability, selectivity, and kinetics of the bioassay were investigated. Under optimal conditions, the fabricated genosensor exhibited a linear response range of 10(-5) to 10(-17) mu M in the standard sample and 7.3 to 1 x 10(-17) mu M in water samples with a low limit of quantification of 0.01 zM in water samples. The detection strategy based on silver plated gold nanostars and DNA hybridization improved the sensitivity and specificity of the assay for E. coli O157:H7 detection in real water samples without filtration. The detection assay has the advantages of high selectivity, sensitivity, low amounts of reagents, short analysis time, commercialization, and potential application for the determination of other pathogenic bacteria.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2022
National Category
Analytical Chemistry
Identifiers
urn:nbn:se:liu:diva-184389 (URN)10.1039/d2ay00056c (DOI)000776261100001 ()35357389 (PubMedID)
Note

Funding Agencies|European UnionEuropean Commission [H2020-MSCA-ITN-2018-813680]

Available from: 2022-04-22 Created: 2022-04-22 Last updated: 2023-05-04Bibliographically approved
Chalangar, E., Nur, O., Willander, M., Gustafsson, A. & Pettersson, H. (2021). Synthesis of Vertically Aligned ZnO Nanorods Using Sol-gel Seeding and Colloidal Lithography Patterning. Nanoscale Research Letters, 16(1), Article ID 46.
Open this publication in new window or tab >>Synthesis of Vertically Aligned ZnO Nanorods Using Sol-gel Seeding and Colloidal Lithography Patterning
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2021 (English)In: Nanoscale Research Letters, ISSN 1931-7573, E-ISSN 1556-276X, Vol. 16, no 1, article id 46Article in journal (Refereed) Published
Abstract [en]

Different ZnO nanostructures can be grown using low-cost chemical bath deposition. Although this technique is cost-efficient and flexible, the final structures are usually randomly oriented and hardly controllable in terms of homogeneity and surface density. In this work, we use colloidal lithography to pattern (100) silicon substrates to fully control the nanorods' morphology and density. Moreover, a sol-gel prepared ZnO seed layer was employed to compensate for the lattice mismatch between the silicon substrate and ZnO nanorods. The results show a successful growth of vertically aligned ZnO nanorods with controllable diameter and density in the designated openings in the patterned resist mask deposited on the seed layer. Our method can be used to fabricate optimized devices where vertically ordered ZnO nanorods of high crystalline quality are crucial for the device performance.

Place, publisher, year, edition, pages
Springer, 2021
National Category
Condensed Matter Physics Materials Chemistry Nano Technology
Identifiers
urn:nbn:se:liu:diva-174072 (URN)10.1186/s11671-021-03500-7 (DOI)000627791200001 ()33709294 (PubMedID)
Note

Funding: Lund University; AForsk Foundation [19-725]; Halmstad University; Linkoping University; Crafoord Foundation

Available from: 2021-03-12 Created: 2021-03-12 Last updated: 2021-04-12Bibliographically approved
Abdala, E., Nur, O. & Mustafa, M. A. (2020). Efficient Biodiesel Production from Algae Oil Using Ca-Doped ZnO Nanocatalyst. Industrial & Engineering Chemistry Research, 59(43), 19235-19243
Open this publication in new window or tab >>Efficient Biodiesel Production from Algae Oil Using Ca-Doped ZnO Nanocatalyst
2020 (English)In: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 59, no 43, p. 19235-19243Article in journal (Refereed) Published
Abstract [en]

Biodiesel is a sustainable alternative to petroleum diesel produced by transesterification of vegetable oils in the presence of a catalyst. The present study investigates heterogeneous transesterification of algal oil to biodiesel using novel calcium-doped zinc oxide nanocatalysts synthesized using a UV shaker. The developed catalyst was under different light sources, UV and non-UV; different calcium concentrations (0.01, 0.03, 0.05 M); and different calcination temperatures (600, 700, 800 degrees C). The catalyst has been characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and energy-dispersive spectroscopy (EDS). The effects of the different parameters used in catalyst preparation were studied for transesterification of algal oil. The catalyst of 0.05 M calcium loading and 700 degrees C calcination temperature synthesized in UV light is considered as the most suitable nanocatalyst, which achieved 99.18% yield of biodiesel. The catalyst was used three times effectively with 76% yield. The chemical properties of biodiesel have been investigated using gas chromatography (GC).

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2020
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-172090 (URN)10.1021/acs.iecr.0c04118 (DOI)000586870700017 ()
Note

Funding Agencies|Osman Elbashir Research Grant under the Chemical Engineering Department at the University of Khartoum

Available from: 2020-12-28 Created: 2020-12-28 Last updated: 2021-10-16Bibliographically approved
Shah, A. A., Bhatti, M. A., Tahira, A., Chandio, A. D., Channa, I. A., Sahito, A. G., . . . Ibupoto, Z. H. (2020). Facile synthesis of copper doped ZnO nanorods for the efficient photo degradation of methylene blue and methyl orange. Ceramics International, 46(8), 9997-10005
Open this publication in new window or tab >>Facile synthesis of copper doped ZnO nanorods for the efficient photo degradation of methylene blue and methyl orange
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2020 (English)In: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, ISSN 0272-8842, Vol. 46, no 8, p. 9997-10005Article in journal (Refereed) Published
Abstract [en]

In this study, zinc oxide (ZnO) nanorods are doped with copper by low temperature aqueous chemical growth method using different concentrations of copper 5 mg, 10 mg, 15 mg and 20 mg and labeled as sample 1, 2, 3 and 4 respectively. The morphology and phase purity of nanostructures was investigated by scanning electron microscopy, and powder X-ray diffraction techniques. The optical characterization was carried out through UV-Vis spectrophotometer. The band gap of coper doped ZnO has brought reduction at 250-600 nm and it indicates the fewer time for the recombination of electron and hole pairs, thus enhanced photo degradation efficiency is found. ZnO exhibits nanorods like shape even after the doping of copper. The photo degradation efficiency for the two chronic dyes such as methyl orange MO and methylene blue MB was found to be 57.5% and 60% respectively for a time of 180 mints. This study suggests that the copper impurity in ZnO can tailor its photocatalytic activity at considerable rate. The proposed photo catalysts are promising and can be used for the waste water treatment and other environmental applications.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Methylene blue; Methyl orange; Copper doping; Band gap; ZnO nanostructures; Photocatalysis
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-164156 (URN)10.1016/j.ceramint.2019.12.024 (DOI)000528481900003 ()2-s2.0-85076538098 (Scopus ID)
Available from: 2020-03-07 Created: 2020-03-07 Last updated: 2024-01-08Bibliographically approved
Adam, R. E., Alnoor, H., Pozina, G., Liu, X., Willander, M. & Nur, O. (2020). Synthesis of Mg-doped ZnO NPs via a chemical low-temperature method and investigation of the efficient photocatalytic activity for the degradation of dyes under solar light. Solid State Sciences, 99, Article ID 106053.
Open this publication in new window or tab >>Synthesis of Mg-doped ZnO NPs via a chemical low-temperature method and investigation of the efficient photocatalytic activity for the degradation of dyes under solar light
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2020 (English)In: Solid State Sciences, ISSN 1293-2558, E-ISSN 1873-3085, Vol. 99, article id 106053Article in journal (Refereed) Published
Abstract [en]

Doped semiconductors nanostructures (NSs) have shown great interest as a potential for green and efficient photocatalysis activities. Magnesium (Mg)-doped zinc oxide (ZnO) nanoparticles (NPs) has been synthesized by a one-step chemical low temperature (60 °C) co-precipitation method without further calcination and their photocatalytic performance for photodegradation of Methylene blue (MB) dye under the illumination of solar light is investigated. The crystal structure of the synthesized NPs is examined by X-ray diffraction (XRD). XRD data indicates a slight shift towards higher 2θ angle in Mg-doped samples as compared to the pure ZnO NPs which suggest the incorporation of Mg2+ into ZnO crystal lattice. X-ray photoelectron spectroscopy (XPS), UV–Vis spectrophotometer and cathodoluminescence (CL) spectroscopy, were used to study electronics, and optical properties, respectively. The XPS analysis confirms the substitution of the Zn2+ by the Mg2+ into the ZnO crystal lattice in agreement with the XRD data. The photocatalytic activities showed a significant enhancement of the Mg-doped ZnO NPs in comparison with pure ZnO NPs. Hole/radical scavengers were used to reveal the mechanism of the photodegradation. It was found that the addition of the Mg to the ZnO lattices increases the absorption of the hydroxyl ions at the surface of the NPs and hence acts as a trap site leading to decrease the electron-hole pair and consequently enhancing the photodegradation.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
ZnO nanoparticles, Mg-doped ZnO NPs, Photocatalytic, Photodegradation, Methylene blue, Congo red
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-164333 (URN)10.1016/j.solidstatesciences.2019.106053 (DOI)000516720100024 ()2-s2.0-85074706430 (Scopus ID)
Available from: 2020-03-18 Created: 2020-03-18 Last updated: 2024-01-08Bibliographically approved
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: 2024-01-08Bibliographically 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, 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: 2024-01-08Bibliographically 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)000485095300022 ()
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: 2024-01-08
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ORCID iD: ORCID iD iconorcid.org/0000-0002-9566-041X

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