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Ul Hasan, Kamran
Alternative names
Publications (10 of 15) Show all publications
Umair Hassan, M., Liu, Y.-C., Butt, H., Hasan, K., Chang, J.-F., Abigael Olawoyin, A. & Henry Friend, R. (2016). Low Thresholds for a Nonconventional Polymer Blend-Amplified Spontaneous Emission and Lasing in F8(1-x):SYx System. Journal of Polymer Science Part B: Polymer Physics, 54(1), 15-21
Open this publication in new window or tab >>Low Thresholds for a Nonconventional Polymer Blend-Amplified Spontaneous Emission and Lasing in F8(1-x):SYx System
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2016 (English)In: Journal of Polymer Science Part B: Polymer Physics, ISSN 0887-6266, E-ISSN 1099-0488, Vol. 54, no 1, p. 15-21Article in journal (Refereed) Published
Abstract [en]

A mixture of two polymer materials, poly (9,9-dioctylfluorene) (F8), and one of the poly(para-phenylenevinylene) derivatives, superyellow (SY) have been used to make F8(1-x):SYx polymer blend system. Under a 3-5 ns pulsed-laser excitation, this system showed excellent optical properties with low threshold values of approximate to 14 mJ/cm(2) and approximate to 8 mJ/cm(2) for amplified spontaneous emission and optically pumped lasing, respectively. The proposed system was also electroluminescent and an interesting candidate for future research on polymer injection lasers. (C) 2015 Wiley Periodicals, Inc.

Place, publisher, year, edition, pages
WILEY-BLACKWELL, 2016
Keywords
amplified spontaneous emission; low threshold; optical pumping; polymer blend
National Category
Chemical Engineering
Identifiers
urn:nbn:se:liu:diva-124109 (URN)10.1002/polb.23947 (DOI)000366509300002 ()
Available from: 2016-01-22 Created: 2016-01-19 Last updated: 2017-11-30
ul Hasan, K., Asif, M., Umair Hassan, M., Sandberg, M. O., Nour, O., Willander, M., . . . Strålfors, P. (2015). A Miniature Graphene-based Biosensor for Intracellular Glucose Measurements. Electrochimica Acta, 174, 574-580
Open this publication in new window or tab >>A Miniature Graphene-based Biosensor for Intracellular Glucose Measurements
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2015 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 174, p. 574-580Article in journal (Refereed) Published
Abstract [en]

We report on a small and simple graphene-based potentiometric sensor for the measurement of intracellular glucose concentration. A fine borosilicate glass capillary coated with graphene and subsequently immobilized with glucose oxidase (GOD) enzyme is inserted into the intracellular environment of a single human cell. The functional groups on the edge plane of graphene assist the attachment with the free amine terminals of GOD enzyme, resulting in a better immobilization. The sensor exhibits a glucose-dependent electrochemical potential against an Ag/AgCl reference microelectrode which is linear across the whole concentration range of interest (10 - 1000 mu M). Glucose concentration in human fat cell measured by our graphene-based sensor is in good agreement with nuclear magnetic resonance (NMR) spectroscopy.

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
Graphene; Bio-sensors; Glucose-oxidase; Intracellular sensors; Graphene oxide; Glucose Sensor
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Clinical Medicine
Identifiers
urn:nbn:se:liu:diva-121309 (URN)10.1016/j.electacta.2015.06.035 (DOI)000359873400073 ()
Available from: 2015-09-16 Created: 2015-09-14 Last updated: 2018-02-13Bibliographically approved
Ul Hasan, K., Sandberg, M. O., Nur, O. & Willander, M. (2014). ZnO/Polyfluorene Hybrid LED on an Efficient Hole-Transport Layer of Graphene Oxide and Transparent Graphene Electrode. Advanced Optical Materials, 2(4), 326-330
Open this publication in new window or tab >>ZnO/Polyfluorene Hybrid LED on an Efficient Hole-Transport Layer of Graphene Oxide and Transparent Graphene Electrode
2014 (English)In: Advanced Optical Materials, ISSN 2195-1071, Vol. 2, no 4, p. 326-330Article in journal (Refereed) Published
Abstract [en]

A novel Inorganic/organic hybrid light emitting diodes (LEDs) have been fabricated using reduced graphene oxide (rGO) films as a transparent conductive electrode and graphene oxide (GO) as a hole transporting layer (HTL). ZnO nanowires (NWs) are obtained by low temperature solution-based procedure. The whole device is fabricated through simple approach of spin coating and screen printing. The results indicate that graphene can be a simple solution processable substitute for PEDOT: PSS as the effective hole transport (electron blocking) layer and the ITO as a transparent conductive electrode in optoelectronic devices.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2014
Keywords
transparent electrodes; graphene; nanostructures; zinc oxide; LEDs
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-106857 (URN)10.1002/adom.201300412 (DOI)000334940900004 ()
Available from: 2014-05-28 Created: 2014-05-23 Last updated: 2014-06-04Bibliographically approved
ul Hasan, K. (2012). Graphene and ZnO Nanostructures for Nano- Optoelectronic & Biosensing Applications. (Doctoral dissertation). Linköping: Linköping University Electronic Press
Open this publication in new window or tab >>Graphene and ZnO Nanostructures for Nano- Optoelectronic & Biosensing Applications
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

There has been a remarkable excitement in graphene research since the famous discovery in 2004 by isolating a monolayer with the help of scotch tape. Graphene, merely a single layer of carbon atoms, is progressively making inroads into a wide range of applications, from ballistic electronics to biosensors to flexible/transparent displays. Graphene is a matchless material that is strong, light, transparent, and an excellent conductor of heat and electricity. On the other hand, zinc oxide (ZnO) is a wide band semiconductor that demonstrates excellent electrical, optical, catalytic and sensing properties and has numerous applications in various fields. ZnO is a natural n-type semiconductor due to the presence of intrinsic defects such as Zn interstitials and O vacancies that also contribute strongly to optical emissions in the visible region.

The amalgamation of the exceptional properties of graphene with good semiconducting properties of ZnO can pave the way towards the realization of future devices (LED, biosensors, photovoltaics etc.).

In this thesis, graphene nanosheets and zinc oxide (ZnO) nanostructures have beensuccessfully synthesized by using chemical vapor deposition (CVD), vapor liquidsolid (VLS) or wet chemistry routines. These nanostructures were used to fabricatenano and optoelectronic devices, including field effect transistors (FETs), lightemitting diodes (LEDs), UV detectors and biosensors. Both nanomaterial’s propertiesand performances of the devices have been characterized and reported.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2012. p. 80
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1458
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-78697 (URN)978-91-7519-869-9 (ISBN)
Public defence
2012-05-29, K3, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 10:15 (English)
Opponent
Supervisors
Available from: 2012-06-18 Created: 2012-06-18 Last updated: 2014-01-15Bibliographically approved
ul Hasan, K., Asif, M. H. & Willander, M. (2012). Needle-Type Glucose Sensor Based on Functionalized Graphene. Journal of Biosensors and Bioelectronics, 3(1)
Open this publication in new window or tab >>Needle-Type Glucose Sensor Based on Functionalized Graphene
2012 (English)In: Journal of Biosensors and Bioelectronics, ISSN 2155-6210, Vol. 3, no 1Article in journal (Refereed) Published
Abstract [en]

We demonstrate a novel, highly efficient glucose sensor based on functionalized graphene. Glucose oxidase (GOD) immobilization has been apprehendedbythe direct interaction between carboxyl acid groups of the reduced graphene oxide (RGO) and amines of GOD together with the electrostatic interactions existing between the positively charged polymeric ionic liquid (PIL) and GOD. This combined system can provide a favorable microenvironment for the GOD to retain its good bioactivity. The enzyme-coated graphene biosensor exhibited glucose-dependent electrochemical measurements against an Ag/AgCl reference electrode. The resulting sensor show broad range detection, up to 100 mM glucose concentration, with a sensitivity of 5.59 μA/ decade. It was found that glucose biosensor based on functionalized graphene can be seen as an effective candidate for the detection of sugar concentration in clinical diagnoses.

National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-78677 (URN)10.4172/2155-6210.1000114 (DOI)
Available from: 2012-06-18 Created: 2012-06-18 Last updated: 2014-01-15Bibliographically approved
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
ul Hasan, K., Nur, O. & Willander, M. (2012). Screen printed ZnO UV photoconductive sensor on pencil drawn circuitry over paper. Applied Physics Letters, 100(21), 211104
Open this publication in new window or tab >>Screen printed ZnO UV photoconductive sensor on pencil drawn circuitry over paper
2012 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 100, no 21, p. 211104-Article in journal (Refereed) Published
Abstract [en]

Many applications require a low-cost and large-scale mode of flexible electronics with reasonably high photoresponse that can be detected without high precision measurement systems. We demonstrate a very easy to fabricate ZnO UV sensor, made on common pencil drawn circuit over a paper. ZnO nanocrystals were extracted in a high throughput via a simple and green route. This sensor is well capable of detecting UV light and demonstrates features comparable to those of made with complex and expensive techniques.

National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-78686 (URN)10.1063/1.4720179 (DOI)000304489900004 ()
Available from: 2012-06-18 Created: 2012-06-18 Last updated: 2017-12-07Bibliographically approved
Sultana, K., ul Hasan, K., Alvi, N. H., Klason, P., Nur, O. & Willander, M. (2011). A comparative study of the electrodeposition and the aqueous chemical growth techniques for the utilization of ZnO nanorods on p-GaN for white light emitting diodes. Superlattices and Microstructures, 49(1), 32-42
Open this publication in new window or tab >>A comparative study of the electrodeposition and the aqueous chemical growth techniques for the utilization of ZnO nanorods on p-GaN for white light emitting diodes
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2011 (English)In: Superlattices and Microstructures, ISSN 0749-6036, E-ISSN 1096-3677, Vol. 49, no 1, p. 32-42Article in journal (Refereed) Published
Abstract [en]

Vertically well aligned zinc oxide nanorods (ZnO NRs) were grown on p-GaN by electrodeposition (ED) and aqueous chemical growth (ACG) techniques and the structures were employed to fabricate white light emitting diodes (LEDs). Room temperature current voltage (IV), photoluminescence (PL), and electroluminescence (EL) measurements were performed to investigate and compare both LEDs. In general, the IV characteristics and the PL spectra of both LEDs were rather similar. Nevertheless, the EL of the ED samples showed an extra emission peak shoulder at 730 nm. Moreover, at the same injection current, the EL spectrum of the ED light emitting diode showed a small UV shift of 12 nm and its white peak was found to be broader when compared to the ACG grown LED. The broadening of the EL spectrum of the LED grown by ED is due to the introduction of more radiative deep level defects. The presented LEDs have shown excellent color rendering indexes reaching a value as high as 95. These results indicate that the ZnO nanorods grown by both techniques possess very interesting electrical and optical properties but the ED is found to be faster and more suitable for the fabrication of white LEDs.

Place, publisher, year, edition, pages
Elsevier, 2011
Keywords
ZnO nanorods; GaN; Chemical growth; White light emitting diodes
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-71312 (URN)10.1016/j.spmi.2010.10.004 (DOI)
Available from: 2011-10-11 Created: 2011-10-11 Last updated: 2017-12-08Bibliographically approved
Ul Hasan, K., Sandberg, M. O., Nur, O. & Willander, M. (2011). Polycation stabilization of graphene suspensions. Nanoscale Research Letters, 6(493)
Open this publication in new window or tab >>Polycation stabilization of graphene suspensions
2011 (English)In: Nanoscale Research Letters, ISSN 1931-7573, E-ISSN 1556-276X, Vol. 6, no 493Article in journal (Refereed) Published
Abstract [en]

Graphene is a leading contender for the next-generation electronic devices. We report a method to produce graphene membranes in the solution phase using polymeric imidazolium salts as a transferring medium. Graphene membranes were reduced from graphene oxides by hydrazine in the presence of the polyelectrolyte which is found to be a stable and homogeneous dispersion for the resulting graphene in the aqueous solution. A simple device with gold contacts on both sides was fabricated in order to observe the electronic properties.

Place, publisher, year, edition, pages
SpringerOpen, 2011
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-72038 (URN)10.1186/1556-276X-6-493 (DOI)000296254800001 ()
Available from: 2011-11-11 Created: 2011-11-11 Last updated: 2017-12-08Bibliographically approved
Ul Hasan, K., Ul Hassan Alvi, N., Lu, J., Nur, O. & Willander, M. (2011). Single nanowire-based UV photodetectors for fast switching. Nanoscale Research Letters, 6(348)
Open this publication in new window or tab >>Single nanowire-based UV photodetectors for fast switching
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2011 (English)In: Nanoscale Research Letters, ISSN 1931-7573, E-ISSN 1556-276X, Vol. 6, no 348Article in journal (Refereed) Published
Abstract [en]

Relatively long (30 mu m) high quality ZnO nanowires (NWs) were grown by the vapor-liquid-solid (VLS) technique. Schottky diodes of single NW were fabricated by putting single ZnO NW across Au and Pt electrodes. A device with ohmic contacts at both the sides was also fabricated for comparison. The current-voltage (I-V) measurements for the Schottky diode show clear rectifying behavior and no reverse breakdown was seen down to -5 V. High current was observed in the forward bias and the device was found to be stable up to 12 V applied bias. The Schottky barrier device shows more sensitivity, lower dark current, and much faster switching under pulsed UV illumination. Desorption and re-adsorption of much smaller number of oxygen ions at the Schottky junction effectively alters the barrier height resulting in a faster response even for very long NWs. The NW was treated with oxygen plasma to improve the switching. The photodetector shows high stability, reversibility, and sensitivity to UV light. The results imply that single ZnO NW Schottky diode is a promising candidate for fabricating UV photodetectors.

Place, publisher, year, edition, pages
Springer Science Business Media, 2011
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-69918 (URN)10.1186/1556-276X-6-348 (DOI)000292290700003 ()
Available from: 2011-08-09 Created: 2011-08-08 Last updated: 2017-12-08
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