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Amin, Gul
Publications (10 of 22) Show all publications
Amin, G., Asif, M., Elsharif Zainelabdin, A., Zaman, S., Nur, O. & Willander, M. (2012). CuO Nanopetals Based Electrochemical Sensor for Selective Ag+ Measurements. SENSOR LETTERS, 10(3-4), 754-759
Open this publication in new window or tab >>CuO Nanopetals Based Electrochemical Sensor for Selective Ag+ Measurements
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2012 (English)In: SENSOR LETTERS, ISSN 1546-198X, Vol. 10, no 3-4, p. 754-759Article in journal (Refereed) Published
Abstract [en]

The electrochemical sensing activity of cupric oxide (CuO) nanopetals was investigated for the detection of silver (I) ions (Ag+). The CuO nanopetals were synthesized on a large area glass substrate by a low-temperature hydrothermal growth process. Structural morphological investigations were carried out using field emission scanning electron microscopy, high resolution transmission electron microscopy, and X-ray diffraction. To check the sensing application of the CuO nanopetals, it was functionalized for selectivity of Ag+. A polymeric membrane with Ag+-selective ionophore was coated on the surface of the CuO nanopetals. CuO nanopetals reveal excellent electrochemical sensing behavior in aqueous solution to selectively detect Ag+. The CuO based sensor exhibits a linear electrochemical response within the concentration range of 1 mu M to 100 mM. The functionalized CuO nanopetal based sensor show stable, fast response and high sensitivity for [Ag+]. This work demonstrates a simple technique for sensitive detection of Ag+ and other biochemical species.

Place, publisher, year, edition, pages
American Scientific Publishers, 2012
Keywords
CuO, Nanopetals, Hydrothermal Method, Ag+-Selective Membrane, Electrochemical Sensor
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-85097 (URN)10.1166/sl.2012.2336 (DOI)000309018700011 ()
Available from: 2012-11-02 Created: 2012-11-02 Last updated: 2018-02-27
Zainelabdin, A., Amin, G., Zaman, S., Nur, O., Lu, J., Hultman, L. & Willander, M. (2012). CuO/ZnO Nanocorals synthesis via hydrothermal technique: growth mechanism and their application as Humidity Sensor. Journal of Materials Chemistry, 22(23), 11583-11590
Open this publication in new window or tab >>CuO/ZnO Nanocorals synthesis via hydrothermal technique: growth mechanism and their application as Humidity Sensor
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2012 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 22, no 23, p. 11583-11590Article in journal (Refereed) Published
Abstract [en]

We demonstrate hydrothermal synthesis of coral-like CuO nanostructures by selective growth on ZnO nanorods (NR) at low temperatures. During the hydrothermal processing the resultant hydroxylated and eroded surface of ZnO NR becomes favorable for the CuO nanostructures growth via oriented attachments. Heterojunction p-n diodes fabricated from the CuO/ZnO nanocorals (NC) reveal stable and high rectification diode properties with a turn-on voltage ~1.52 V and negligible reverse current. The humidity sensing characteristics of the CuO/ZnO NC diodes exhibit a remarkable linear (in a semilogarithmic scale) decrease in the DC resistance by more than three orders when the relative humidity is changed from 30 – 90 %. The NC humidity sensor is also found to reveal the highest sensitivity factor ~6045 among available data for the constituent material’s and a response and recovery time of 6 s and 7 s, respectively.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2012
Keywords
Zinc oxide nanorods, copper oxide nanostructures, nanocorals, relative humidity, sensitivity factor
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-76676 (URN)10.1039/c2jm16597j (DOI)000304351400026 ()
Note
funding agencies|Swedish government||Available from: 2012-04-16 Created: 2012-04-16 Last updated: 2017-12-07Bibliographically approved
Zaman, S., Zainelabdin, A., Amin, G., Nour, O. & Willander, M. (2012). Efficient catalytic effect of CuO nanostructures on the degradation of organic dyes. Journal of Physics and Chemistry of Solids, 73(11), 1320-1325
Open this publication in new window or tab >>Efficient catalytic effect of CuO nanostructures on the degradation of organic dyes
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2012 (English)In: Journal of Physics and Chemistry of Solids, ISSN 0022-3697, E-ISSN 1879-2553, Vol. 73, no 11, p. 1320-1325Article in journal (Refereed) Published
Abstract [en]

An efficient catalytic effect of petals and flowers like CuO nanostructures (NSs) on the degradation of two organic dyes, methylene blue (MB) and rhodamine B (RB) were investigated. The highest degradation of 95% in CuO petals and 72% in flowers for MB is observed in 24 h. For RB, the degradation was 85% and 80% in petals and flowers, respectively for 5 h. It was observed that CuO petals appeared to be more active than flowers for degradation of both dyes associated to high specific surface area. The petals and flower like CuO NSs were synthesized using the chemical bath method at 90 °C. The grown CuO NSs were characterized using scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD).

Keywords
A. Nanostructures; B. Chemical synthesis; C. X-ray diffraction; D. Crystal structure
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-81427 (URN)10.1016/j.jpcs.2012.07.005 (DOI)000308778900012 ()
Note

funding agencies|Advanced Functional Materials (AFT) grant at Linkoping University, Sweden||MUST University AJK, Pakistan||

Available from: 2012-09-14 Created: 2012-09-14 Last updated: 2017-12-07Bibliographically approved
Alvi, N. H., Soto Rodriguez, P. E., Gomez, V. J., Kumar, P., Amin, G., Nur, O., . . . Noetzel, R. (2012). Highly efficient potentiometric glucose biosensor based on functionalized InN quantum dots. Applied Physics Letters, 101(15), 153110
Open this publication in new window or tab >>Highly efficient potentiometric glucose biosensor based on functionalized InN quantum dots
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2012 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 101, no 15, p. 153110-Article in journal (Refereed) Published
Abstract [en]

We present a fast, highly sensitive, and efficient potentiometric glucose biosensor based on functionalized InN quantum-dots (QDs). The InN QDs are grown by molecular beam epitaxy. The InN QDs are bio-chemically functionalized through physical adsorption of glucose oxidase (GOD). GOD enzyme-coated InN QDs based biosensor exhibits excellent linear glucose concentration dependent electrochemical response against an Ag/AgCl reference electrode over a wide logarithmic glucose concentration range (1 x 10(-5) M to 1 x 10(-2) M) with a high sensitivity of 80mV/decade. It exhibits a fast response time of less than 2 s with good stability and reusability and shows negligible response to common interferents such as ascorbic acid and uric acid. The fabricated biosensor has full potential to be an attractive candidate for blood sugar concentration detection in clinical diagnoses. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4758701]

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2012
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-85857 (URN)10.1063/1.4758701 (DOI)000310304900068 ()
Note

Funding Agencies|BBVA foundation||

Available from: 2012-11-30 Created: 2012-11-30 Last updated: 2017-12-07
Zaman, S., Zainelabdin, A., Amin, G., Nour, O. & Willander, M. (2012). Influence of the polymer concentration on the electroluminescence of ZnO nanorod/polymer hybrid light emitting diodes. Journal of Applied Physics, 112(6), 064324
Open this publication in new window or tab >>Influence of the polymer concentration on the electroluminescence of ZnO nanorod/polymer hybrid light emitting diodes
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2012 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 112, no 6, p. 064324-Article in journal (Refereed) Published
Abstract [en]

The effects of the polymer concentration on the performance of hybrid light emitting diodes (LEDs) based on zinc oxide nanorods (ZnO NRs) and poly(9,9-dioctylfluorene) (PFO) was investigated. Various characterization techniques were applied to study the performance of the PFO/ZnO NR hybrid LEDs fabricated with various PFO concentrations. The fabricated hybrid LEDs demonstrated stable rectifying diode behavior, and it was observed that the turn-on voltage of the LEDs is concentration dependent. The measured room temperature electroluminescence (EL) showed that the PFO concentration plays a critical role in the emission spectra of the hybrid LEDs. At lower PFO concentrations of 2-6 mg/ml, the EL spectra are dominated by blue emission. However, by increasing the concentration to more than 8 mg/ml, the blue emission was completely suppressed while the green emission was dominant. This EL behavior was explained by a double trap system of excitons that were trapped in the β-phase and/or in the fluorenone defects in the PFO side. The effects of current injection on the hybrid LEDs and on the EL emission were also investigated. Under a high injection current, a new blue peak was observed in the EL spectrum, which was correlated to the creation of a new chemical species on the PFO chain. The green emission peak was also enhanced with increasing injection current because of the fluorenone defects. These results indicate that the emission spectra of the hybrid LEDs can be tuned by using different polymer concentrations and by varying the current injected into the device.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2012
Keywords
Hybrid light emitting diodes, ZnO nanorods, PFO, electroluminescence
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-81426 (URN)10.1063/1.4754542 (DOI)000309423200142 ()
Available from: 2012-09-14 Created: 2012-09-14 Last updated: 2017-12-07Bibliographically approved
Elsharif Zainelabdin, A., Nur, O., Amin, G., Zaman, S. & Willander, M. (2012). Metal Oxide Nanostructures and White Light Emission. Proceedings of SPIE, the International Society for Optical Engineering, 8263(82630N)
Open this publication in new window or tab >>Metal Oxide Nanostructures and White Light Emission
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2012 (English)In: Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X, E-ISSN 1996-756X, Vol. 8263, no 82630NArticle in journal (Refereed) Published
Abstract [en]

We report on white light emission from zinc oxide nanostructures chemically grown on paper substrates. The effect of the growth solution pH on the morphology is discussed. The light emission form light emitting diodes based on ZnO nanorods/organic polymer hybrids on paper substrate is presented. Further copper oxide was grown on the walls of zinc oxide nanorods and the optical properties were investigated.

Place, publisher, year, edition, pages
International Society for Optical Engineering; 1999, 2012
Keywords
nanostructures; zinc oxide; copper oxide
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-87980 (URN)10.1117/12.909342 (DOI)000303381200013 ()
Available from: 2013-01-28 Created: 2013-01-28 Last updated: 2017-12-06
Zainelabdin, A., Zaman, S., Amin, G., Nur, O. & Willander, M. (2012). Optical and current transport properties of CuO/ZnO nanocoral p-n heterostructure hydrothermally synthesized at low temperature. Applied Physics A: Materials Science & Processing, 108(4), 921-928
Open this publication in new window or tab >>Optical and current transport properties of CuO/ZnO nanocoral p-n heterostructure hydrothermally synthesized at low temperature
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2012 (English)In: Applied Physics A: Materials Science & Processing, ISSN 0947-8396, E-ISSN 1432-0630, Vol. 108, no 4, p. 921-928Article in journal (Refereed) Published
Abstract [en]

We demonstrate the synthesis and investigate the electrical and optical characteristics of nanocorals (NCs) composed of CuO/ZnO grown at low temperature through the hydrothermal approach. High-density CuO nanostructures (NSs) were selectively grown on ZnO nanorods (NRs). The synthesized NCs were used to fabricate p-n heterojunctions that were investigated by the current density-voltage (J-V) and the capacitance-voltage (C-V) techniques. It was found that the NC heterojunctions exhibit a well-defined diode behavior with a threshold voltage of about 1.52 V and relatively high rectification factor of similar to 760. The detailed forward J-V characteristics revealed that the current transport is controlled by an ohmic behavior for V andlt;= 0.15 V, whereas at moderate voltages 1.46 andlt;= V andlt; 1.5 the current follows a J alpha exp(beta V) relationship. At higher voltages (andgt;= 1.5 V) the current follows the relation J alpha V-2, indicating that the space-charge-limited current mechanism is the dominant current transport. The C-V measurement indicated that the NC diode has an abrupt junction. The grown CuO/ZnO NCs exhibited a broad light absorption range that is covering the UV and the entire visible parts of the spectrum.

Place, publisher, year, edition, pages
Springer Verlag (Germany), 2012
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-81220 (URN)10.1007/s00339-012-6995-2 (DOI)000307332800022 ()
Available from: 2012-09-10 Created: 2012-09-10 Last updated: 2017-12-07
Willander, M., Ul Hasan, K., Nur, O., Zainelabdin, A., Zaman, S. & Amin, G. (2012). Recent progress on growth and device development of ZnO and CuO nanostructures and graphene nanosheets. Journal of Materials Chemistry, 22(6), 2337-2350
Open this publication in new window or tab >>Recent progress on growth and device development of ZnO and CuO nanostructures and graphene nanosheets
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2012 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 22, no 6, p. 2337-2350Article in journal (Refereed) Published
Abstract [en]

Recent progress on the growth of zinc oxide (ZnO), copper oxide (CuO) and graphene nanosheets is presented and discussed. We here restrict the discussion to the hydrothermal low temperature growth regime. In view of this the most critical and important parameters for obtaining nanostructures with desired morphology are discussed and presented. Among all parameters, the temperature and the pH during growth were chosen due to their strong role in affecting the produced nanostructures. The application of this method to non-conventional substrates e. g. paper, is demonstrated. Different devices are fabricated using the grown material and their performance is discussed.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2012
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-75118 (URN)10.1039/c1jm15152e (DOI)000299178500001 ()
Available from: 2012-02-21 Created: 2012-02-17 Last updated: 2017-12-07
Amin, G., Sandberg, M. O., Zainelabdin, A., Zaman, S., Nur, O. & Willander, M. (2012). Scale-up synthesis of ZnO nanorods for printing inexpensive ZnO/polymer white light-emitting diode. Journal of Materials Science, 47(11), 4726-4731
Open this publication in new window or tab >>Scale-up synthesis of ZnO nanorods for printing inexpensive ZnO/polymer white light-emitting diode
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2012 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 47, no 11, p. 4726-4731Article in journal (Refereed) Published
Abstract [en]

In this study, possibilities of scaling up the synthesis of zinc oxide (ZnO) nanorods (NRs) by the hydrothermal method have been explored. It was found that batches yielding several grams can easily be made using common and easily available materials. Further, a printable composition was fabricated by mixing the obtained ZnO NRs into a common solvent-based screen printable varnish. Scanning electron microscope, high-resolution transmission electron microscope, X-ray diffraction, UV–vis spectroscopy analysis of the scaled up batch indicated that the ZnO nanostructures were of NRs shape, well crystalline and having less defects. Using the ZnO NRs-based printable composition a device fabrication on a flexible substrate was demonstrated, producing a flexible light-emitting device being highly tolerant to bending.

Place, publisher, year, edition, pages
Springer, 2012
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-76674 (URN)10.1007/s10853-012-6342-1 (DOI)000302244500026 ()
Available from: 2012-04-16 Created: 2012-04-16 Last updated: 2017-12-07Bibliographically approved
Willander, M., Nur, O., Amin, G., Zainelabdin, A. & Zaman, S. (2012). Zinc oxide and copper oxide nanostructures: Fundamentals and applications. In: Materials Research Society Symposium Proceedings: vol 1406. Paper presented at Materials Research Society Symposium (pp. 3-10). Warrendale, Pa.; Materials Research Society; 1999, 1406
Open this publication in new window or tab >>Zinc oxide and copper oxide nanostructures: Fundamentals and applications
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2012 (English)In: Materials Research Society Symposium Proceedings: vol 1406, Warrendale, Pa.; Materials Research Society; 1999 , 2012, Vol. 1406, p. 3-10Conference paper, Published paper (Refereed)
Abstract [en]

Copper oxide (CuO) and zinc oxide (ZnO) nanostructures complement each other since CuO is unintentional p-type and ZnO unintentional n-type. Using the low temperature chemical growth approach, the effect on morphology of varying the pH of the grown ZnO nanostructures and CuO micro structures is monitored. For both materials the variation of the pH was found to lead to a large variation on the morphology achieved. The grown ZnO NRs and CuO micro flowers material were used to fabricate devices. We demonstrate results from ZnO nanorods (NRs)/polymer p-n hybrid heterojunctions chemically grown on paper and using a process on paper for light emitting diodes (LEDs) applications as well as some large area light emitting diodes LEDs. The growth of CuO micro flowers indicated good quality material for sensing applications. The grown CuO micro flowers were employed as pH sensors. The results indicated a superior performance as expect due to the catalytic properties of this material. © 2012 Materials Research Society.

Place, publisher, year, edition, pages
Warrendale, Pa.; Materials Research Society; 1999, 2012
Series
Materials Research Society Symposium Proceedings, ISSN 0272-9172
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-101137 (URN)10.1557/opl.2012.65 (DOI)
Conference
Materials Research Society Symposium
Available from: 2013-11-20 Created: 2013-11-19 Last updated: 2017-02-23
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