Versatile computer-controlled system for characterization of gas sensing materials

Abstract

Enhanced H2 sensitivity at room temperature of ZnO nanowires functionalized by Pd nanoparticles J. Appl. Phys. 110, 084312 (2011) Expanded beam deflection method for simultaneous measurement of displacement and vibrations of multiple microcantilevers Rev. Sci. Instrum. 82, 105112 (2011) High quality factor graphene varactors for wireless sensing applications Appl. Phys. Lett. 99, 163105 (2011) The extended surface forces apparatus. IV. Precision static pressure control Rev. Sci. Instrum. 82, 103902 (2011) Effect of temperature on CO detection sensitivity of ZnO nanorod-gated AlGaN/GaN high electron mobility transistors Appl. Phys. Lett. 99, 142107 (2011) Additional information on Rev. Sci. Instrum. Design of a system used for characterizing gas sensing materials is described. It is distinctive of being able to measure electrical and optical responses of a sample simultaneously, control a number of measurement parameters, perform fast exchange of gaseous environment, and be fully controlled automatically. These features make the system to be versatile in determining most concerned performance indexes of a gas sensing material (e.g., sensitivity, stability, selectivity, response/recovery times, etc.) as functions of various combinations of measurement conditions (e.g., gas concentrations, temperature, total pressure, content of interferants, photo assist, relative humidity, soaking time in a fixed gas concentration, and number of switching cycles in a dynamic test, etc.). Rationales of the designs associated with general gas sensing mechanics are discussed.

8.5.4 Fabrication and Characterization of MEMS Based Optical Hydrogen Sensors

“…Phase transition from α to β is shown after 6% in Fig. 3 (a) [6]. However, Pd catalyst increased reaction of WO 3 with hydrogen in Fig.…”

Improved H2-sensing performance of nanocluster-based highly porous tungsten oxide films operating at moderate temperature

“…Resistive H 2 sensing properties of film samples were investigated by using a homemade system [22], Fig. 2.…”

Room-temperature resistive H2sensing response of Pd/WO3nanocluster-based highly porous film

“…n crystal is the refractive index of bulk WO 3 , equal to 2.5. H 2 -induced room-temperature resistive response of a Pd/SCBD WO 3 film was investigated by using a home-made system, which was highly versatile and fully automated [26]. A sample was placed in the measurement chamber of the system.…”