Electrochemically growth of Pd doped ZnO nanorods on QCM for room temperature VOC sensors

Pristine and various palladium (Pd) doped ZnO nanorods have been synthesized on the quartz crystal microbalance (QCM) for volatile organic compound (VOCs) sensors at room temperature. The doping concentrations were varied from 0 mol% to 2.5 mol% by using electrochemical deposition method. The diameters of the fabricated nanorods were in the range of 100-200 nm, and were increased with Pd doping. The tested VOCs included alcohols (ethanol, methanol, isopropyl), ester (ethyl acetate), aromatic (toluene, xylene), ketone (acetone) and chloroform in the different concentrations. The results indicated that the sensitivity of the sensing materials was enhanced with the increasing Pd doping concentrations except for the acetone and chloroform. The undoped ZnO nanorod sensor showed higher sensor response against to acetone and chloroform while exposing high concentration of two analytes due to the absorbing/adsorbing mechanism. All undoped and Pd doped nanorods sensors showed the highest sensitivity to xylene. © 2015 Published by Elsevier B.V.TD1105-16434, Year-2 113F403, 111M261 European Cooperation in Science and Technology National Council for Scientific ResearchThis study was partly supported by The Scientific and Technological Research Council of Turkey (TUBITAK) , Grant number (GN): 113F403 , GN: 111M261 and by COST Action TD1105 EuNetAir – European Network on New Sensing Technologies for Air-Pollution Control and Environmental Sustainability – by a Short Term Scientific Mission Year-2 (STSM- TD1105-16434 , from 03-03-2014 to 28-03-2014): “Functionalization of ZnO Nanorods With Metals and Metal oxides For Gas Sensing Applications”. Sadullah Öztürk received his M.Sc. and Ph.D. degrees in physics from Gebze Institute of Technology in 2009 and 2014. He is an assistant professor at Fatih Sultan Mehmet Vakif University, Biomedical Engineering Department, Istanbul, Turkey. His research interest are hydrothermal and electrochemical deposition. Metal oxide based gas sensors. Arif Kösemen received his M.Sc. degree in physics from Gebze Institute of Technology in 2009. He is a research assistant at Department of Physics of Mus Alparslan University. His research interests are: organic/metal oxide based solar cells, electrochemical deposition and chromic devices. Zuhal Alpaslan Kösemen received his M.Sc. degree in physics from Gebze Institute of Technology in 2009. She is a senior researcher at The Scientific and Technological Research Council of Turkey (TUBITAK). Her research interests are: organic field effect transistor, optical characterization, electrochemical deposition. Necmettin Kılınç received the B.Sc. degree from Marmara University, Istanbul, in 2003, and M.Sc. and Ph.D. degrees from Gebze Institute of Technology in 2006 and 2012, all in Physics, respectively. After his Ph.D., he started to post doc at Optical Microsystems Laboratory Koc University to research cantilever based biosensors. He is an assistant professor at Nigde University, Mechatronics Engineering Department, Nigde, Turkey. His research interests are fabrication of nanostructures and thin films of metal oxides and organic materials and structural and electrical properties of these materials and using these materials for bio-chemical sensor applications. Zafer Ziya Öztürk is professor of solid-state physics at Gebze Institute of Technology, Turkey. He received his undergraduate education at Hacettepe University, Ankara, Turkey and the graduate education at the Technical University of Darmstadt, Germany, Ph.D. degree in 1982. He was a postdoctoral fellow at the Institute for Physical Chemistry, University of Tuebingen, Germany. He has held several research, teaching and scientist positions including University of Dicle, Diyarbakir, TUBITAK Marmara Research Center, Gebze and University of Marmara, Istanbul, Turkey. His research interests involve solid-state device sensors, molecular electronics, chemical and biochemical sensors. Michele Penza graduated in physics from the University of Bari (Italy) in 1990. He was a fellow of the INFM in 1991. Since 1992, he has worked at the Science and Technology Park, Brindisi (Italy) first as fellow and then as researcher. His main scientific activities and interests are preparation and characterization of thin films for acoustic, electrical and optical sensing devices, SAW, QCM and TFBAR gas/vapor sensors, micro-acoustic sensors, sensor arrays for chemical detection, functional characterization of sensing transducers and arrays, processing of sensor nanostructured materials, design and fabrication of sensing devices, pattern recognition, environmental monitoring applications. Actually, he is a researcher of ENEA, Italian National Agency for New Technologies, Energy and Environment, at Department of Physical Technologies and New Materials working in the field of chemical sensors and sensor nanomaterials

Performance Enhancement of İnverted Type Organic Solar Cells By Using Eu Doped TiO2 Thin Film

In the present work, europium (Eu) has been used as a dopant element in titanium dioxide (TiO2) crystal structure to enhance the photovoltaic performance of the inverted type organic solar cells fabricated with TiO2 thin film as an electron transport layer. Poly(3-hexylthiophene):phenylC61-butyric acid methyl ester (P3HT: PCBM) blend has been used as an active layer and Eu:TiO2 thin films have been fabricated with different Eu concentrations as 0, 1, 5, 7 and 10% (w/w) by sol-gel method. Effect of Eu doping concentration on the photovoltaic performance of the inverted type solar cells has been investigated. Inverted type organic solar cells using Eu doped TiO2 thin films as electron transport layer has been fabricated as a structure of ITO/Eu:TiO2/P3HT:PCBM/Ag. Power conversion efficiency of the fabricated solar cells increased from 1.16% to 2.47% at 5% Eu doping concentration. Electron transport and hole blocking properties of the TiO2 inter layer has been improved by Eu doping. © 2017 Elsevier B.V.Ahi Evran Üniversitesi: MMF.A3.16.009This research is supported by Ahi Evran University Grant no.: MMF.A3.16.009