Effect of water vapor on Pd-loaded SnO2 nanoparticles gas sensor.

The effect of water vapor on Pd-loaded SnO2 sensor was investigated through the oxygen adsorption behavior and sensing properties toward hydrogen and CO under different humidity conditions. On the basis of the theoretical model reported previously, it was found that the mainly adsorbed oxygen species on the SnO2 surface in humid atmosphere was changed by loading Pd, more specifically, for neat SnO2 was O(-), while for 0.7% Pd-SnO2 was O(2-). The water vapor poisoning effect on electric resistance and sensor response was reduced by loading Pd. Moreover the sensor response in wet atmosphere was greatly enhanced by loading Pd. It seems that the electron depletion layer by p-n junction of PdO-SnO2 may impede OH(-) adsorption.

[1]  N. Bârsan,et al.  Ambivalent effect of Ni loading on gas sensing performance in SnO2 based gas sensor , 2013 .

[2]  N. Yamazoe,et al.  Influence of Reduction Treatment on CO Sensing Properties of SnO2-based Gas Sensor , 2006 .

[3]  Kengo Shimanoe,et al.  Extension of receptor function theory to include two types of adsorbed oxygen for oxide semiconductor gas sensors , 2012 .

[4]  N. Bârsan,et al.  Spectroscopic insights into CO sensing of undoped and palladium doped tin dioxide sensors derived from hydrothermally treated tin oxide sol , 2006 .

[5]  Adisorn Tuantranont,et al.  Ultra-sensitive H2 sensors based on flame-spray-made Pd-loaded SnO2 sensing films , 2013 .

[6]  T. Seiyama,et al.  A New Detector for Gaseous Components Using Semiconductive Thin Films. , 1962 .

[7]  N. Yamazoe,et al.  Gas reception and signal transduction of neat tin oxide semiconductor sensor for response to oxygen , 2013 .

[8]  Chao-Nan Xu,et al.  Grain size effects on gas sensitivity of porous SnO2-based elements , 1991 .

[9]  Norio Miura,et al.  Electronic Interaction between Metal Additives and Tin Dioxide in Tin Dioxide-Based Gas Sensors , 1988 .

[10]  M. Rumyantseva,et al.  Role of surface hydroxyl groups in promoting room temperature CO sensing by Pd-modified nanocrystalline SnO2 , 2010 .

[11]  O. Safonova,et al.  Characterization of the H2 sensing mechanism of Pd-promoted SnO2 by XAS in operando conditions. , 2005, Chemical communications.

[12]  J. Morante,et al.  Micromachined twin gas sensor for CO and O2 quantification based on catalytically modified nano-SnO2 , 2006 .

[13]  N. Yamazoe.  New approaches for improving semiconductor gas sensors , 1991 .

[14]  Kengo Shimanoe,et al.  Two types of moisture effects on the receptor function of neat tin oxide gas sensor to oxygen , 2013 .

[15]  H. Einaga,et al.  CO Oxidation Over TiO2-Supported Pt–Fe Catalysts Prepared by Coimpregnation Methods , 2014, Catalysis Letters.

[16]  N. Bârsan,et al.  Operando X-ray absorption spectroscopy studies on Pd-SnO2 based sensors. , 2009, Physical chemistry chemical physics : PCCP.

[17]  K. Shimanoe,et al.  Nanoparticle cluster gas sensor: controlled clustering of SnO₂ nanoparticles for highly sensitive toluene detection. , 2014, ACS applied materials & interfaces.

[18]  Udo Weimar,et al.  The effect of Pt and Pd surface doping on the response of nanocrystalline tin dioxide gas sensors to CO , 1996 .

[19]  Eduard Llobet,et al.  Interaction of water, hydrogen and their mixtures with SnO2 based materials: the role of surface hydroxyl groups in detection mechanisms. , 2010, Physical chemistry chemical physics : PCCP.

[20]  U. Weimar,et al.  Understanding the fundamental principles of metal oxide based gas sensors; the example of CO sensing with SnO2 sensors in the presence of humidity , 2003 .

[21]  H. Einaga,et al.  Preparation of platinum nanoparticles on TiO2 from DNA-protected particles , 2014 .

[22]  Noboru Yamazoe,et al.  Interactions of tin oxide surface with O2, H2O AND H2 , 1979 .

[23]  H. Einaga,et al.  Preparation of highly dispersed platinum catalysts on various oxides by using polymer-protected nanoparticles , 2011 .

[24]  Nicolae Barsan,et al.  DRIFT studies of thick film un-doped and Pd-doped SnO2 sensors: temperature changes effect and CO detection mechanism in the presence of water vapour , 2003 .