Abstract
Flexible polypyrrole nanosheets (thickness ∼150 nm) grown at the air-liquid interface have been investigated for charge transport and NH 3 sensing application. Polypyrrole nanosheets films exhibited a uniform and dense morphology. Temperature dependent charge transport measurements revealed that the PPy films obey Mott's 3-D variable range hopping mechanism. The mobility values calculated using temperature dependent current voltage characteristics indicated them to obey Arrhenius behaviour. These films exhibited a reversible response towards NH3 at room temperature. The sensor exhibited a sensitivity of ∼12% with a typical response and recovery times of 240 s and 50 min, respectively towards 50 ppm of NH3. Raman studies indicated that there is an increase in the antisymmetrical C-N stretching upon exposure to higher concentration of NH3 (500 ppm) and could be assigned to the interaction of NH3 with the carbon backbone of PPy film. Our results clearly emphasize that these flexible PPy films could be used to realize flexible sensors.
| Original language | English |
|---|---|
| Pages (from-to) | 300-306 |
| Number of pages | 7 |
| Journal | Materials Chemistry and Physics |
| Volume | 140 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published (in print/issue) - 15 Jun 2013 |
Funding
This work is partly supported by “DAE-SRC Outstanding Research Investigator Award” ( 2008/21/05-BRNS ) and “Prospective Research Funds” ( 2008/38/02-BRNS ) granted to D.K.A. Mr. Purushottam Jha joined Bhabha Atomic Research Center (BARC) in 2008 as scientific officer after receiving M.Sc. (chemistry) from Banaras Hindu University, Varanasi. He has synthesized porphyrin derivatives and organic-inorganic nanocomposites for applications in molecular memories, gas sensors and field emission. He is currently pursuing his Ph.D. on conducting polymer based FET and gas sensors. Dr. Niranjan Ramgir completed his PhD (Physics) in 2006 from National Chemical Laboratory, Pune, India. After completing his Humboldt fellowship at Nanotechnology Group, University of Freiburg, Germany, he joined BARC as Scientific Officer. His current research work is focused on applications of organic and inorganic semiconducting materials like polypyrrole, ZnO, WO 3 , CuO and SnO 2 based thin films and nanostructures for sensing, e-nose and photovoltaic applications. Mr. Preetam Kumar Sharma is presently working as a project trainee, at Technical Physics Division, BARC. He is pursuing his masters in nanotechnology at Centre for Converging Technologies, University of Rajasthan, Jaipur. His research interest includes study of growth and applications of organic and inorganic nanostructures for gas sensing and e-nose applications. Ms. Niyanta Datta has completed her B.Sc. (Hons) in Physics from Delhi University and M.Sc in Physics from IIT Roorkee in 2008. She joined BARC through in 2008 through 52nd batch of training school. Currently she is working as a scientific officer-C and her interests include study of charge transport and gas sensing properties of various nanostructures. Mrs. S. Kailasaganapathi completed her B.Sc., in Physics from Manonmanium Sundaranar University, Tirunelveli, Tamilnadu, India in 2003. She joined BARC in 2006 as a Scientific Assistant. Her research work involves development of gas sensors based on metal-oxides. Dr Manmeet Kaur received her PhD from Devi Ahilya Vishwavidyalaya, Indore in 1998. Her thesis work involved effect of heavy ion irradiation on high temperature superconductors. She joined BARC, Mumbai in 1999 as research associate. Her present interests include development of metal oxide thin films and nano-materials for sensing toxic gases. Dr. S.P. Koiry joined BARC in 2004 as Scientific Officer after obtaining his M.Sc. (chemistry) from Assam University, Silchar. He is currently working on monolayer/multilayers of electrographted silane molecules, porphyrin derivatives and, organic dyes and self-assembled monolayers for various device applications. Dr. Vibha Saxena joined BARC in 2004 as scientific officer. She received her Ph.D. (Physics) from Mumbai University in 2000. Over the years she worked on conducting polymer based light-emitting diodes, electrochemical transistors and biosensors. Her present interests are organic field-effect transistors, gas sensors and solar cells. Dr. A.K. Debnath is presently working as Scientific Officer (F) at Technical Physics Division of BARC. He has extensively worked on oxide materials based gas sensor, particularly for H 2 S detection. His current research interest is to understand the charge transport and gas sensing properties of ultra thin films of organic semiconductor grown using MBE. Dr. Anil K. Chauhan joined BARC in 1992 through 36nd Batch of Training School and is presently working as a Scientific Officer at Technical Physics Division of BARC. His research interest includes organic solar cells and electronics. Dr. Ajay Singh joined BARC in 1999 through 42nd Batch of Training School after completing M.Sc. (Physics) from Garhwal University. He completed his Ph.D. from Mumbai University in 2004. Presently he is working on charge transport studies of metal phthalocyanine thin films and development of thermoelectric devices. He is a recipient of Humboldt Post-doctoral fellowship (2005–2007), DAE Young Scientist Award for excellence in the Science and Technology-2007, National Academy of Sciences India (NASI) Young Scientist Platinum Jubilee Award-2010 in Physical Science. Dr. D. K. Aswal joined BARC in 1986 through 30th Batch of Training School after completing M.Sc. (Physics) from Garhwal University and is presently Head of Thin Films Devices Section. His area of scientific interest is condensed matter physics, specializing in device-oriented research leading to hybrid molecule-on-Si nanoelectronics, thermoelectric devices, and gas sensors. He is a recipient of several international fellowships including, JSPS fellowship, Japan (1997–99), IFCPAR fellowship, France (2004–05), BMBF fellowship, Germany (2006) and CEA fellowship, France (2008). He is recipient of several awards, including “MRSI Medal 2010”, “Homi Bhabha Science and Technology Award-2007”, “DAE-SRC Outstanding Research Investigator Award-2008”, and “Paraj: Excellence in Science Award, 2000”. Dr. S. K. Gupta joined BARC in 1975 and is presently Head of Technical Physics Division. Over the years, he has worked on space quality silicon solar cells, high temperature superconductor thin films and single crystals, gas sensors and thermoelectric materials. He has carried out extensive studies on vortex dynamics in superconductors. He is a member of the National Academy of Sciences, India.
Keywords
- Polymers Electrical characterisation Interfaces Nanostructures Transport properties
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