Room temperature H2S sensor based on Au modified ZnO nanowires

Niranjan S. Ramgir; Preetam K. Sharma; N. Datta; M. Kaur; A. K. Debnath; D. K. Aswal; S. K. Gupta

doi:10.1016/j.snb.2013.06.070

Room temperature H₂S sensor based on Au modified ZnO nanowires

Niranjan S. Ramgir
, Preetam K. Sharma
, N. Datta
, M. Kaur
, A. K. Debnath
, D. K. Aswal
, S. K. Gupta

Research output: Contribution to journal › Article › peer-review

219 Citations (Scopus)

Abstract

A room temperature H₂S sensor based on pure and Au modified ZnO nanowires has been demonstrated. Modification of ZnO nanowires with Au resulted in a remarkable 16-fold increase in the sensor response over pure ZnO NWs toward 5 ppm H₂S at room temperature. A sensing mechanism based on the formation of nano-Schottky type barrier junction at the interface between Au and ZnO has been proposed. The enhanced response is attributed to the alteration of barrier properties by the adsorption or desorption of adsorbed species and/or H₂S gas molecules. Observance of higher resistivity and a higher work function (0.2 eV) for Au modified samples further corroborates the finding. Low temperature resistivity measurements indicate that the charge transport is governed by the thermal conduction and the nearest neighbor hopping mechanism.

Original language	English
Pages (from-to)	718-726
Number of pages	9
Journal	Sensors and Actuators, B: Chemical
Volume	186
DOIs	https://doi.org/10.1016/j.snb.2013.06.070
Publication status	Published (in print/issue) - 29 Jul 2013

Funding

This work is 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. Dr. Niranjan S. Ramgir completed his Ph.D. (Physics) in 2006 from National Chemical Laboratory, Pune, India. After completing his Humboldt fellowship at Nanotechnology Group, University of Freiburg, Germany, he joined Bhabha Atomic Research Center 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 K. Sharma is presently working as a project trainee, at Technical Physics Division, BARC. He is pursuing his masters in nanotechnology at 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. N. Datta has completed her B.Sc. (Hons) in Physics from Delhi University and M.Sc. in Physics from IIT Roorkee in 2008. She joined Bhabha Atomic Research Center 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. Dr. M. Kaur received her Ph.D. from Devi Ahilya Vishwavidyalaya, Indore in 1998. Her thesis work involved effect of heavy ion irradiation on high temperature superconductors. She joined Bhabha Atomic Research Center, Mumbai in 1999 as research associate. Her present interests include development of metal oxide thin films and nano-materials for sensing toxic gases. 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. D.K. Aswal joined Bhabha Atomic Research Center 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 (1997–1999), IFCPAR fellowship, France (2004–2005), 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 Bhabha Atomic Research Center 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

Au
HS
Nanowires
Sensors
Work function
ZnO

Access to Document

10.1016/j.snb.2013.06.070

Cite this

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title = "Room temperature H2S sensor based on Au modified ZnO nanowires",

abstract = "A room temperature H2S sensor based on pure and Au modified ZnO nanowires has been demonstrated. Modification of ZnO nanowires with Au resulted in a remarkable 16-fold increase in the sensor response over pure ZnO NWs toward 5 ppm H2S at room temperature. A sensing mechanism based on the formation of nano-Schottky type barrier junction at the interface between Au and ZnO has been proposed. The enhanced response is attributed to the alteration of barrier properties by the adsorption or desorption of adsorbed species and/or H2S gas molecules. Observance of higher resistivity and a higher work function (0.2 eV) for Au modified samples further corroborates the finding. Low temperature resistivity measurements indicate that the charge transport is governed by the thermal conduction and the nearest neighbor hopping mechanism.",

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AU - Ramgir, Niranjan S.

AU - Sharma, Preetam K.

AU - Datta, N.

AU - Kaur, M.

AU - Debnath, A. K.

AU - Aswal, D. K.

AU - Gupta, S. K.

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