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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, 2706-2714 p.Article 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, 972-979 p.Article 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
Keyword
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, 3695-3701 p.Article 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
Keyword
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
Elhag, S., Khun, K., Khranovskyy, V., Liu, X., Willander, M. & Nour, O. (2016). Efficient Donor Impurities in ZnO Nanorods by Polyethylene Glycol for Enhanced Optical and Glutamate Sensing Properties. Sensors, 16(2).
Open this publication in new window or tab >>Efficient Donor Impurities in ZnO Nanorods by Polyethylene Glycol for Enhanced Optical and Glutamate Sensing Properties
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2016 (English)In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 16, no 2Article in journal (Refereed) Published
Abstract [en]

In this paper, we show that the possibility of using polyethylene glycol (EG) as a hydrogen source and it is used to assist the hydrothermal synthesis of ZnO nanorods (ZNRs). EG doping in ZNRs has been found to significantly improve their optical and chemical sensing characteristics toward glutamate. The EG was found to have no role on the structural properties of the ZNRs. However, the x-ray photoelectron spectroscopy (XPS) suggests that the EG could induce donor impurities effect in ZnO. Photoluminescence (PL) and UV-Vis. spectra demonstrated this doping effect. Mott-Schottky analysis at the ZNRs/electrolyte interface was used to investigate the charge density for the doped ZNRs and showed comparable dependence on the used amount of EG. Moreover, the doped ZNRs were used in potentiometric measurements for glutamate for a range from 10(-6) M to 10(-3) M and the potential response of the sensor electrode was linear with a slope of 91.15 mV/decade. The wide range and high sensitivity of the modified ZNRs based glutamate biosensor is attributed to the doping effect on the ZNRs that is dictated by the EG along with the high surface area-to-volume ratio. The findings in the present study suggest new avenues to control the growth of n-ZnO nanostructures and enhance the performance of their sensing devices.

Place, publisher, year, edition, pages
MDPI AG, 2016
Keyword
potentiometric sensor; ZnO nanorods; glutamate; doping
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Chemical Sciences Physical Sciences
Identifiers
urn:nbn:se:liu:diva-126849 (URN)10.3390/s16020222 (DOI)000371787800096 ()26861342 (PubMedID)
Note

Funding Agencies|University of Kordofan, El-Obeid, Kordofan Sudan [700]

Available from: 2016-04-05 Created: 2016-04-05 Last updated: 2017-11-30
Alnoor, H., Pozina, G., Khranovskyy, V., Liu, X., Iandolo, D., Willander, M. & Nur, O. (2016). Influence of ZnO seed layer precursor molar ratio on the density of interface defects in low temperature aqueous chemically synthesized ZnO nanorods/GaN light-emitting diodes. Journal of Applied Physics, 119(16), 165702.
Open this publication in new window or tab >>Influence of ZnO seed layer precursor molar ratio on the density of interface defects in low temperature aqueous chemically synthesized ZnO nanorods/GaN light-emitting diodes
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2016 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 119, no 16, 165702- p.Article in journal (Refereed) Published
Abstract [en]

Low temperature aqueous chemical synthesis (LT-ACS) of zinc oxide (ZnO) nanorods (NRs) has been attracting considerable research interest due to its great potential in the development of light-emitting diodes (LEDs). The influence of the molar ratio of the zinc acetate (ZnAc): KOH as a ZnO seed layer precursor on the density of interface defects and hence the presence of non-radiative recombination centers in LT-ACS of ZnO NRs/GaN LEDs has been systematically investigated. The material quality of the as-prepared seed layer as quantitatively deduced by the X-ray photoelectron spectroscopy is found to be influenced by the molar ratio. It is revealed by spatially resolved cathodoluminescence that the seed layer molar ratio plays a significant role in the formation and the density of defects at the n-ZnO NRs/p-GaN heterostructure interface. Consequently, LED devices processed using ZnO NRs synthesized with molar ratio of 1:5M exhibit stronger yellow emission (similar to 575 nm) compared to those based on 1:1 and 1:3M ratios as measured by the electroluminescence. Furthermore, seed layer molar ratio shows a quantitative dependence of the non-radiative defect densities as deduced from light-output current characteristics analysis. These results have implications on the development of high-efficiency ZnO-based LEDs and may also be helpful in understanding the effects of the ZnO seed layer on defect-related non-radiative recombination. Published by AIP Publishing.

Place, publisher, year, edition, pages
AMER INST PHYSICS, 2016
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-129174 (URN)10.1063/1.4947593 (DOI)000375929900043 ()
Note

Funding Agencies|Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]

Available from: 2016-06-13 Created: 2016-06-13 Last updated: 2017-11-28
Nour, E., Chey, C., Willander, M. & Nur, O. (2016). Low frequency accelerator sensor based on piezoelectric ZnO nanorods grown by low temperature scalable process. Physica Status Solidi (a) applications and materials science, 213(9), 2503-2508.
Open this publication in new window or tab >>Low frequency accelerator sensor based on piezoelectric ZnO nanorods grown by low temperature scalable process
2016 (English)In: Physica Status Solidi (a) applications and materials science, ISSN 1862-6300, E-ISSN 1862-6319, Vol. 213, no 9, 2503-2508 p.Article in journal (Refereed) Published
Abstract [en]

Piezoelectric vertically aligned zinc oxide (ZnO) nanorods (NRs) were grown by low temperature aqueous chemical approach and successfully used as a low frequency self-powered accelerator detector system. The nanogenerator (NG) device was tested under the influence of low frequency vibrations, different load masses, and finger prints pressure. The experimental results show relatively high sensitivity to frequencies as low as 5 Hz. This energy conversion device has produced a maximum output voltage of about 0.3 and 1.4 V under a frequency of 41 Hz and a mass of 1000 g, respectively. The fabricated NG can be used as an accelerator sensor with a good performance in the range from about 0.67 to 5.5 m s−2 with a sensitivity of 0.045 V s2 m−1. Furthermore, it has been demonstrated that the NG is able to harvest energy under finger-print scanning. The result from the finger-print pressure was consistent with the masses testing results. This energy-harvesting technology also provides a simple and cost-effective platform to capture low-frequency mechanical energy, i.e., body movements, and other applications like developing a sensitive finger print camera, etc.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2016
National Category
Nano Technology
Identifiers
urn:nbn:se:liu:diva-128901 (URN)10.1002/pssa.201600142 (DOI)000388318600035 ()
Note

Funding agencies: Advanced Functional Materials (AFM) at Linkoping University, Sweden; CeNano grant at Linkoping University, Sweden

Available from: 2016-06-07 Created: 2016-06-07 Last updated: 2017-05-11Bibliographically approved
Nour, E., Bondarevs, A., Huss, P., Sandberg, M., Gong, S., Willander, M. & Nour, O. (2016). Low-Frequency Self-Powered Footstep Sensor Based on ZnO Nanowires on Paper Substrate. Nanoscale Research Letters, 11(156).
Open this publication in new window or tab >>Low-Frequency Self-Powered Footstep Sensor Based on ZnO Nanowires on Paper Substrate
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2016 (English)In: Nanoscale Research Letters, ISSN 1931-7573, E-ISSN 1556-276X, Vol. 11, no 156Article in journal (Refereed) Published
Abstract [en]

In this work, we design and fabricate a wireless system with the main operating device based on zinc oxide (ZnO) nanowires. The main operating device is based on piezoelectric nanogenerator (NG) achieved using ZnO nanowires grown hydrothermally on paper substrate. The fabricated NG is capable of harvesting ambient mechanical energy from various kinds of human motion, e.g., footsteps. The harvested electric output has been used to serve as a self-powered pressure sensor. Without any storage device, the signal from a single footstep has successfully triggered a wireless sensor node circuit. This study demonstrates the feasibility of using ZnO nanowire piezoelectric NG as a low-frequency self-powered sensor, with potential applications in wireless sensor networks.

Place, publisher, year, edition, pages
SPRINGER, 2016
Keyword
ZnO; Hydrothermal growth; Piezoelectric nanowire; Nanogenerator; Energy harvesting; Wireless data transmission
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-127433 (URN)10.1186/s11671-016-1373-1 (DOI)000373089300004 ()27000024 (PubMedID)
Note

Funding Agencies|CeNano grant; Swedish Government strategic research area in material science on functional materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]

Available from: 2016-05-01 Created: 2016-04-26 Last updated: 2017-11-30
Strelchuk, V. V., Nikolenko, A. S., Kolomys, O. F., Rarata, S. V., Avramenko, K. A., Lytvyn, P. M., . . . Willander, M. (2016). Optical and structural properties of Mn-doped ZnO nanorods grown by aqueous chemical growth for spintronic applications. Thin Solid Films, 601, 22-27.
Open this publication in new window or tab >>Optical and structural properties of Mn-doped ZnO nanorods grown by aqueous chemical growth for spintronic applications
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2016 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 601, 22-27 p.Article in journal (Refereed) Published
Abstract [en]

The effect of Mn-doping on the structural, morphological, optical and magnetic properties of the ZnO:Mn nanorods (NRs) synthesized by aqueous chemical process is reported. Grown ZnO:Mn NRs are shown to have hexagonal end facets and the diameters increasing with nominal Mn content. Optical absorption measurements show a decrease in optical band gap with increase of Mn concentration. Raman spectroscopy revealed significant modification of the lattice vibrational properties of the ZnO matrix upon Mn doping. The additional Mn-related vibrational mode, intensity of which increases with amount of Mn can be regarded as an evidence of Mn incorporation into the host lattice of the ZnO. At high Mn concentrations, coexistence of hexagonal Zn1-xMnxO phase along with the secondary phases of ZnMn2O4 cubic spinel is revealed. Magnetic properties of ZnO: Mn NRs are studied by combinatorial atomic force microscopy and magnetic force microscopy imaging, and obtained clear magnetic contrast at room temperature provides a strong evidence of ferromagnetic behavior. (C) 2015 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA, 2016
Keyword
Zinc oxide; Nanorods; Aqueous chemical growth; Spintronics; Optical properties; Raman spectroscopy; Magnetic properties; Magnetic-force microscopy
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-126869 (URN)10.1016/j.tsf.2015.11.019 (DOI)000371348700006 ()
Available from: 2016-04-05 Created: 2016-04-05 Last updated: 2017-11-30
Arain, M., Nafady, A., Sirajuddin, ., Ibupoto, Z., Sherazi, S. T., Shaikh, T., . . . Willander, M. (2016). Simpler and highly sensitive enzyme-free sensing of urea via NiO nanostructures modified electrode. RSC Advances, 6(45), 39001-39006.
Open this publication in new window or tab >>Simpler and highly sensitive enzyme-free sensing of urea via NiO nanostructures modified electrode
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2016 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 6, no 45, 39001-39006 p.Article in journal (Refereed) Published
Abstract [en]

In this study, NiO nanostructures were synthesized via a hydrothermal process using ascorbic acid as doping agent in the presence of ammonia. As prepared nanostructures were characterized using Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Brunauer-Emmett-Teller (BET) specific surface area analysis, and thermogravimetric analysis (TGA). These analyses showed that these nanostructures are in the form of cotton-like porous material and crystalline in nature. Furthermore, the average size of these NiO crystallites was estimated to be 3.8 nm. These nanostructures were investigated for their potential to be a highly sensitive and selective enzyme-free sensor for detection of urea after immobilizing on a glassy carbon electrode (GCE) using 0.1% Nafion as binder. The response of this as developed amperometric sensor was linear in the range of 100-1100 mu M urea with a R-2 value of 0.990 and limit of detection (LOD) of 10 mu M. The sensor responded negligibly to various interfering species including glucose, uric acid, and ascorbic acid. This sensor was applied successfully for determining urea in real water samples such as mineral water, tap water, and river water with acceptable recovery.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2016
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-128775 (URN)10.1039/c6ra00521g (DOI)000374972800062 ()
Note

Funding Agencies|Deanship of Scientific Research group at King Saud University by Prolific Research Group [PRG-1437-30]

Available from: 2016-05-30 Created: 2016-05-30 Last updated: 2017-11-30
Sadollah Khani, A., Nour, O., Willander, M., Kazeminezhad, I., Khranovskyy, V., Eriksson, M. O., . . . Holtz, P.-O. (2015). A detailed optical investigation of ZnO@ZnS core-shell nanoparticles and their photocatalytic activity at different pH values. Ceramics International, 41(5), 7174-7184.
Open this publication in new window or tab >>A detailed optical investigation of ZnO@ZnS core-shell nanoparticles and their photocatalytic activity at different pH values
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2015 (English)In: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 41, no 5, 7174-7184 p.Article in journal (Refereed) Published
Abstract [en]

In this study zinc oxide nanoparticles (NPs) were synthesized via a co-precipitation method and were covered by zinc sulfate using a chemical approach at a temperature of 60 degrees C forming ZnO@ZnS core-shell nanoparticles (CSNPs). In order to investigate the effect of the shell thickness on the optical and photocatalytic properties, many samples were grown with different concentration of the sulfur source. The results show that, covering ZnO with ZnS leads to form a type II band alignment system. In addition, the band gap of the ZnO@ZnS CSNPs was found less than both of the core and the shell materials. Also the emission peak intensity of the ZnO NPs changes as a result of manipulating oxygen vacancies via covering. The photocatalytic activity of the ZnO@ZnS CSNPs was invpstigated for degradation of the Congo red dye. As dye pollutants can be found in mediums with different pH, the experiments were performed at three pH values to determine the best photocatalyst for each pH. Congo red dye degradation experiments indicate that the ZnO@ZnS CSNPs act more efficiently as a photcatalyst at pH values of 4 and 7 compare to the pure ZnO NPs.

Place, publisher, year, edition, pages
Elsevier, 2015
Keyword
A. Chemical preparation; B. Spectroscopy; C. Optical properties; D. ZnO
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Chemical Sciences
Identifiers
urn:nbn:se:liu:diva-118021 (URN)10.1016/j.ceramint.2015.02.040 (DOI)000353176400070 ()
Note

Funding Agencies|Shahid Chamran University; Linkoping University; Linkoping Linne Initiative

Available from: 2015-05-21 Created: 2015-05-20 Last updated: 2017-12-04
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ORCID iD: ORCID iD iconorcid.org/0000-0001-6235-7038

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