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Israr, Muhammed Qadir
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Ali, A., Israr-Qadir, M., Wazir, Z., Tufail, M., Ibupoto, Z. H., Jamil-Rana, S., . . . Willander, M. (2015). Cobalt oxide magnetic nanoparticles-chitosan nanocomposite based electrochemical urea biosensor. Indian Journal of Physics, 89(4), 331-336
Öppna denna publikation i ny flik eller fönster >>Cobalt oxide magnetic nanoparticles-chitosan nanocomposite based electrochemical urea biosensor
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2015 (Engelska)Ingår i: Indian Journal of Physics, ISSN 0973-1458, E-ISSN 0974-9845, Vol. 89, nr 4, s. 331-336Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this study, a potentiometric urea biosensor has been fabricated on glass filter paper through the immobilization of urease enzyme onto chitosan/cobalt oxide (CS/Co3O4) nanocomposite. A copper wire with diameter of 500 mu m is attached with nanoparticles to extract the voltage output signal. The shape and dimensions of Co3O4 magnetic nanoparticles are investigated by scanning electron microscopy and the average diameter is approximately 80-100 nm. Structural quality of Co3O4 nanoparticles is confirmed from X-ray powder diffraction measurements, while the Raman spectroscopy has been used to understand the chemical bonding between different atoms. The magnetic measurement has confirmed that Co3O4 nanoparticles show ferromagnetic behavior, which could be attributed to the uncompensated surface spins and/or finite size effects. The ferromagnetic order of Co3O4 nanoparticles is raised with increasing the decomposition temperature. A physical adsorption method is adopted to immobilize the surface of CS/Co3O4 nanocomposite. Potentiometric sensitivity curve has been measured over the concentration range between 1 x 10(-4) and 8 x 10(-2) M of urea electrolyte solution revealing that the fabricated biosensor holds good sensing ability with a linear slope curve of similar to 45 mV/decade. In addition, the presented biosensor shows good reusability, selectivity, reproducibility and resistance against interferers along with the stable output response of similar to 12 s.

Ort, förlag, år, upplaga, sidor
Springer Verlag (Germany), 2015
Nyckelord
Potentiometric biosensors; Metal oxide; Nanoparticles and urea sensing
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:liu:diva-117212 (URN)10.1007/s12648-014-0594-3 (DOI)000351564800004 ()
Anmärkning

Funding Agencies|King Saud University, Deanship of Scientific Research, College of Science Research Center

Tillgänglig från: 2015-04-22 Skapad: 2015-04-21 Senast uppdaterad: 2018-02-27
Israr Qadir, M., Jamil Rana, S., Nur, O., Willander, M., Lu, J. & Hultman, L. (2014). Cathodoluminescence characterization of ZnO nanorods synthesized by chemical solution and of its conversion to ellipsoidal morphology. Journal of Materials Research, 29(20), 2425-2431
Öppna denna publikation i ny flik eller fönster >>Cathodoluminescence characterization of ZnO nanorods synthesized by chemical solution and of its conversion to ellipsoidal morphology
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2014 (Engelska)Ingår i: Journal of Materials Research, ISSN 0884-2914, E-ISSN 2044-5326, Vol. 29, nr 20, s. 2425-2431Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A facile and reproducible low-temperature (80 degrees C) solution route has been introduced to synthesize ZnO ellipsoids on silicon substrate without any pretreatment of the substrate or organic/inorganic additives. Scanning electron microscopy, transmission electron microscopy, and x-ray diffraction spectroscopy are performed to analyze the structural evolution, the single crystalline nature, and growth orientation at different stages of the synthetic process. The sequential formation mechanisms of heterogeneous nucleation in primary and secondary crystal growth behaviors have been discussed in detail. The presented results reveal that the morphology of micro/nanostructures with desired features can be optimized. The optical properties of grown structures at different stages were investigated using cathodoluminescence (CL). The monochromatic CL images were recorded to examine the UV and visible band emission contributions from the different positions of the intermediate and final structures of the individual ZnO ellipsoid. Significant enhancement in the defect level emission intensity at the central position of the structure reveals that the quality of the material improves as the reaction time is extended.

Ort, förlag, år, upplaga, sidor
Cambridge University Press (CUP): STM Journals, 2014
Nationell ämneskategori
Elektroteknik och elektronik Fysik
Identifikatorer
urn:nbn:se:liu:diva-112831 (URN)10.1557/jmr.2014.242 (DOI)000344477500008 ()
Anmärkning

Funding Agencies|Higher Education Commission (HEC), Pakistan

Tillgänglig från: 2015-01-08 Skapad: 2014-12-17 Senast uppdaterad: 2018-02-27
Israr Qadir, M., Jamil Rana, S., Nur, O., Willander, M., Larsson, L. & Holtz, P.-O. (2014). Fabrication of ZnO nanodisks from structural transformation of ZnO nanorods through natural oxidation and their emission characteristics. Ceramics International, 40(1), 2435-2439
Öppna denna publikation i ny flik eller fönster >>Fabrication of ZnO nanodisks from structural transformation of ZnO nanorods through natural oxidation and their emission characteristics
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2014 (Engelska)Ingår i: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 40, nr 1, s. 2435-2439Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

An environmentally benign natural oxidation based synthetic technique has been developed to grow and transform the ZnO nanorods into nanodisks at a very mild temperature of 55 degrees C with excellent features of its novelty and reproducibility. Metallic zinc foil and formamide solution have been utilized as substrate and reacting solution, respectively, for the growth of ZnO nanostructures. The optimized values of temperature, concentration of formamide and the reaction time are achieved to obtain the controlled and desired nanoscale morphologies. Detailed mechanism of the structural transformation of the nanorods into nanodisks has been discussed. Strong ultraviolet emission peak along with the much weaker deep level defects related emission has been realized in the microphotoluminescence spectrum. A visible red-shift and decrease in the intensity of ultraviolet peak are observed with increasing range of temperature from 20 to 300 K.

Ort, förlag, år, upplaga, sidor
Elsevier, 2014
Nyckelord
Zinc oxide; Formamide; Natural oxidation; Nanodisks; Emission characteristics
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:liu:diva-105038 (URN)10.1016/j.ceramint.2013.08.017 (DOI)000330820600151 ()
Tillgänglig från: 2014-03-06 Skapad: 2014-03-06 Senast uppdaterad: 2017-12-05
Kishwar, S., Siddique, M., Israr, M. Q., Nour, O., Willander, M. & Öllinger, K. (2014). Investigation of the phototoxic effect of ZnO nanorods on fibroblasts and melanoma human cells. Laser Physics Letters, 11(11), Article ID 115606.
Öppna denna publikation i ny flik eller fönster >>Investigation of the phototoxic effect of ZnO nanorods on fibroblasts and melanoma human cells
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2014 (Engelska)Ingår i: Laser Physics Letters, ISSN 1612-2011, E-ISSN 1612-202X, Vol. 11, nr 11, artikel-id 115606Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Photo-cytotoxicity of zinc oxide (ZnO) nanowires (NWs) either bare or conjugated with photosensitizers was studied in dark and after ultraviolet light exposure, in human melanoma and foreskin fibroblast cells. ZnO NWs were grown on the capillary tip and then coated with photosensitizer. This coated tip was used as pointer for intracellular insertion of ZnO NWs and photosensitizer. ZnO NWs pointer was inserted into a specific cell and then irradiated with ultraviolet (UVA), which led to loss of mitochondrial membrane potential, as estimated by loss of the Mitotracker Red staining. Dissolved ZnO NWs showed cytotoxicity as detected by MTT viability assay and morphological evaluation. UVA-irradiation enhanced the toxicity and caused the production of reactive oxygen species (ROS) resulting in cell necrosis. ZnO NWs were photo-toxic for both normal and cancer cells, questioning their bio-safety.

Ort, förlag, år, upplaga, sidor
Institute of Physics (IOP), 2014
Nyckelord
ZnO nanowires, photodynamic therapy, reactive oxygen species, δ- Aminolevulinic acid, protoporphyrin 1X
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:liu:diva-71316 (URN)10.1088/1612-2011/11/11/115606 (DOI)000345221100016 ()
Anmärkning

The previous status of this article was Manuscript and the working title was Photo toxicity of Zinc Oxide Nanowires in Human Melanoma and Fibroblast Cells.

Tillgänglig från: 2011-10-11 Skapad: 2011-10-11 Senast uppdaterad: 2018-07-19Bibliografiskt granskad
Jamil-Rana, S., Israr-Qadir, M., Nur, O. & Willander, M. (2014). Naturally oxidized synthesis of ZnO dahlia-flower nanoarchitecture. Ceramics International, 40(8), 13667-13671
Öppna denna publikation i ny flik eller fönster >>Naturally oxidized synthesis of ZnO dahlia-flower nanoarchitecture
2014 (Engelska)Ingår i: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 40, nr 8, s. 13667-13671Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Three dimensional ZnO dahlia-flowers have been engineered at room temperature relying on natural oxidation based aqueous chemical synthetic approach. Glycine abetted multicomponent isotropic morphology has been synthesized through the conglomeration of thin nanopetals as building blocks with highly large surface area to volume ratio. Highly controllable morphology of thin nanopetals is achieved by stabilizing their polar faces through the adsorption of reactive hydroxyl and amide functions of glycine. Fourier transform infrared conclusions also exemplify good corroboration towards the use of organic additives. Moreover, the synthesized ZnO flowers have been utilized to fabricate cholesterol biosensor and biosensing measurements which have been performed over the cholesterol concentration range of 1 x 10(-6) M to 1 x 10(-3) M.

Ort, förlag, år, upplaga, sidor
Elsevier, 2014
Nyckelord
Zinc oxide; Glycine; FTIR; Aqueous chemical growth; Cholesterol biosensing
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:liu:diva-110470 (URN)10.1016/j.ceramint.2014.04.108 (DOI)000340321300133 ()
Tillgänglig från: 2014-09-15 Skapad: 2014-09-12 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
Batool, S. S., Imran, Z., Israr Qadir, M., Usman, M., Jamil, H., Rafiq, M. A., . . . Willander, M. (2013). Comparative Analysis of Ti, Ni, and Au Electrodes on Characteristics of TiO2 Nanofibers for Humidity Sensor Application. Journal of Materials Science & Technology, 29(5), 411-414
Öppna denna publikation i ny flik eller fönster >>Comparative Analysis of Ti, Ni, and Au Electrodes on Characteristics of TiO2 Nanofibers for Humidity Sensor Application
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2013 (Engelska)Ingår i: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 29, nr 5, s. 411-414Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The effect of metal (Ti, Ni, and Au) electrodes on humidity sensing properties of electrospun TiO2 nanofibers was investigated in this work. The devices were fabricated by evaporating metal contacts on SiO2 layer thermally grown on silicon substrate. The separation between the electrodes was 90 mm for all sensors. The sensors were tested from 40% to 90% relative humidity (RH) by AC electrical characterization at room temperature. When sensors are switched between 40% and 90% RH, the corresponding response and recovery time are 3 s and 5 s for Ti-electrode sensor, 4 s and 7 s for Ni-electrode sensor, and 7 s and 13 s for Au-electrode sensor. The hysteresis was 3%, 5% and 15% for Ti-, Ni-, and Au-electrode sensor, respectively. The sensitivity of Ti, Ni, and Au-electrode sensors are 7.53 M Omega/% RH, 5.29 MU/% RH and 4.01 M Omega/% RH respectively at 100 Hz. Therefore Ti-electrode sensor is found to have linear response, fast response and recovery time and higher sensitivity as compared with those of Ni- and Au-electrode sensors. Comparison of humidity sensing properties of sensors with different electrode material may propose a compelling route for designing and optimizing humidity sensors.

Ort, förlag, år, upplaga, sidor
Elsevier, 2013
Nyckelord
Titanium dioxide, Nanofibers, Metal electrodes, Humidity sensor
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:liu:diva-95978 (URN)10.1016/j.jmst.2013.02.017 (DOI)000321707100004 ()
Anmärkning

Funding Agencies|Higher Education Commission (HEC), Pakistan||

Tillgänglig från: 2013-08-19 Skapad: 2013-08-12 Senast uppdaterad: 2018-02-27
Imran, Z., Batool, S. S., Jamil, H., Usman, M., Israr Qadir, M., Shah, S. H., . . . Willander, M. (2013). Excellent humidity sensing properties of cadmium titanate nanofibers. Ceramics International, 39(1), 457-462
Öppna denna publikation i ny flik eller fönster >>Excellent humidity sensing properties of cadmium titanate nanofibers
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2013 (Engelska)Ingår i: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 39, nr 1, s. 457-462Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We report humidity sensing characteristics of CdTiO3 nanofibers prepared by electrospinning. The nanofibers were porous having an average diameter and length of similar to 50-200 nm and similar to 100 mu m, respectively. The nanofiber humidity sensor was fabricated by defining aluminum electrodes using photolithography on top of the nanofibers deposited on glass substrate. The performance of the CdTiO3 nanofiber humidity sensor was evaluated by AC electrical characterization from 40% to 90% relative humidity at 25 degrees C. The frequency of the AC signal was varied from 10(-1) to 10(6) Hz. Fast response time and recovery time of 4 s and 6 s were observed, respectively. The sensor was highly sensitive and exhibited a reversible response with small hysteresis of less than 7%. Long term stability of the sensor was confirmed during 30 day test. The excellent sensing characteristics prove that the CdTiO3 nanofibers are potential candidate for use in high performance humidity sensors.

Ort, förlag, år, upplaga, sidor
Elsevier, 2013
Nyckelord
Cadmium titanate, Nanofibers, Humidity sensor, Response time
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:liu:diva-90214 (URN)10.1016/j.ceramint.2012.06.048 (DOI)000315246300059 ()
Anmärkning

Funding Agencies|Higher Education Commission (HEC), Pakistan||

Tillgänglig från: 2013-03-21 Skapad: 2013-03-21 Senast uppdaterad: 2017-12-06
Psychoyios, V. N., Nikoleli, G.-P., Tzamtzis, N., Nikolelis, D. P., Psaroudakis, N., Danielsson, B., . . . Willander, M. (2013). Potentiometric Cholesterol Biosensor Based on ZnO Nanowalls and Stabilized Polymerized Lipid Film. Electroanalysis, 25(2), 367-372
Öppna denna publikation i ny flik eller fönster >>Potentiometric Cholesterol Biosensor Based on ZnO Nanowalls and Stabilized Polymerized Lipid Film
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2013 (Engelska)Ingår i: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109, Vol. 25, nr 2, s. 367-372Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A novel potentiometric cholesterol biosensor was fabricated by immobilization of cholesterol oxidase into stabilized lipid films using zinc oxide (ZnO) nanowalls as measuring electrode. Cholesterol oxidase was incorporated into the lipid film prior polymerization on the surface of ZnO nanowalls resulting in a sensitive, selective, stable and reproducible cholesterol biosensor. The potentiometric response was 57mV/ decade concentration. The sensor response had no interferences by normal concentrations of ascorbic acid, glucose, and urea, proteins and lipids. The present biosensor could be implanted in the human body because of the biocompatibility of the lipid film.

Ort, förlag, år, upplaga, sidor
John Wiley & Sons, 2013
Nyckelord
ZnO nanowalls, Potentiometric nanosensors, Cholesterol oxidase, Cholesterol, Stabilized lipid films
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:liu:diva-90207 (URN)10.1002/elan.201200591 (DOI)000314920000005 ()
Tillgänglig från: 2013-03-21 Skapad: 2013-03-21 Senast uppdaterad: 2017-12-06
Ali, A., AlSalhi, M. S., Atif, M., Ansari, A. A., Israr, M. Q., Sadaf, J. R., . . . Willander, M. (2013). Potentiometric urea biosensor utilizing nanobiocomposite of chitosan-iron oxide magnetic nanoparticles. In: 21st International Laser Physics Workshop 23–27 July 2012, Calgary, Canada: . Paper presented at 21st International Laser Physics Workshop (LPHYS 2012), 23-27 July 2012, Calgary, Canada. Institute of Physics (IOP), 414, Article ID 012024.
Öppna denna publikation i ny flik eller fönster >>Potentiometric urea biosensor utilizing nanobiocomposite of chitosan-iron oxide magnetic nanoparticles
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2013 (Engelska)Ingår i: 21st International Laser Physics Workshop 23–27 July 2012, Calgary, Canada, Institute of Physics (IOP), 2013, Vol. 414, artikel-id 012024Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The iron oxide (Fe3O4) magnetic nanoparticles have been fabricated through a simple, cheap and reproducible approach. Scanning electron microscope, x-rays powder diffraction of the fabricated nanoparticles. Furthermore, the fabrication of potentiometric urea biosensor is carried out through drop casting the initially prepared isopropanol and chitosan solution, containing Fe3O4 nanoparticles, on the glass fiber filter with a diameter of 2 cm and a copper wire (of thickness −500 μm) has been utilized to extract the voltage signal from the functionalized nanoparticles. The functionalization of surface of the Fe3O4 nanoparticles is obtained by the electrostatically immobilization of urease onto the nanobiocomposite of the chitosan- Fe3O4 in order to enhance the sensitivity, specificity, stability and reusability of urea biosensor. Electrochemical detection procedure has been adopted to measure the potentiometric response over the wide logarithmic concentration range of the 0.1 mM to 80 mM. The Fe3O4 nanoparticles based urea biosensor depicts good sensitivity with ~42 mV per decade at room temperature. Durability of the biosensor could be considerably enhanced by applying a thin layer of the nafion. In addition, the reasonably stable output response of the biosensor has been found to be around 12 sec.

Ort, förlag, år, upplaga, sidor
Institute of Physics (IOP), 2013
Serie
Journal of Physics: Conference Series, ISSN 1742-6588, E-ISSN 1742-6596 ; 414
Nyckelord
iron oxide (Fe3O4) magnetic nanoparticles; emission characteristics; potentiometric response; urea biosensor; chitosan solution
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:liu:diva-96519 (URN)10.1088/1742-6596/414/1/012024 (DOI)000315404300024 ()
Konferens
21st International Laser Physics Workshop (LPHYS 2012), 23-27 July 2012, Calgary, Canada
Tillgänglig från: 2013-08-21 Skapad: 2013-08-20 Senast uppdaterad: 2019-07-05
Batool, S. S., Imran, Z., Israr Qadir, M., Jamil Rana, S., Usman, M., Jamil, H., . . . Willander, M. (2013). Silica nanofibers based impedance type humidity detector prepared on glass substrate. Vacuum, 87, 1-6
Öppna denna publikation i ny flik eller fönster >>Silica nanofibers based impedance type humidity detector prepared on glass substrate
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2013 (Engelska)Ingår i: Vacuum, ISSN 0042-207X, E-ISSN 1879-2715, Vol. 87, s. 1-6Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Impedance type relative humidity detector is fabricated by depositing electrospun silica nanofibers on glass substrate. The silica nanofibers with an average diameter similar to 150 nm and length similar to 100 mu m were used. Thermogravimetric and differential scanning calorimetric analysis confirm that the accurate annealing temperature is 500 degrees C for complete removal of PVP. Humidity detecting devices were fabricated by defining titanium electrodes on top of the silica nanofibers. The performance of silica nanofibers humidity detectors was tested by AC electrical measurements at 40-90% relative humidity. The response and the recovery times were 5 s and 3 s, respectively, between 40% and 90% relative humidity. Contribution of dipoles, space charge polarization, relaxation of these dipoles and low frequency dispersion phenomenon were observed during impedance measurements.

Ort, förlag, år, upplaga, sidor
Elsevier, 2013
Nyckelord
SiO2 nanofibers, Electric modulus, Humidity detector, Response time
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:liu:diva-86108 (URN)10.1016/j.vacuum.2012.06.016 (DOI)000310549900001 ()
Anmärkning

Funding Agencies|Higher Education Commission (HEC)||

Tillgänglig från: 2012-12-07 Skapad: 2012-12-07 Senast uppdaterad: 2017-12-07
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