Effect of Ce<SUP>3+</SUP> and Pd<SUP>2+</SUP> Doping on Coral-Like Nanostructured SnO<SUB>2</SUB> as Acetone Gas Sensor

Abstract

SnO2 nanocrystals with coral-like porous structure were prepared with sol-gel method combining with an annealing process. The crystallite size and structure of SnO2 were characterized with X-ray diffraction and scanning electron microscope. The average coral-like nanostructrured SnO2 crystallite size is about 13 nm. The acetone gas sensors were obtained by sintering the mixture of coral-like porous nanostructured SnO2 and PdCl2, Ce(NO3)3 respectively. The acetone gas sensing properties of the mixed solid powder were measured by the commercial gas-sensing measurement system. Pd-doped sensors show decreased sensitivity to acetone, compared to that of the undoped sensor. On the other hand, the sensor based on 0.5 mol% Ce-doped shows the highest response to acetone at 190 degrees C. It exhibits a good linear relationship with the acetone concentration (10 - 1000 ppm) in logarithmic forms, which can provide potential applications for acetone detecting.

Oxygen-induced abnormal photoelectric behavior of a MoO3/graphene heterocomposite

“…Recently, easily synthesized metal oxide nanostructures which exhibit many outstanding properties have been reported [13][14][15] and used to tune the properties of other materials by interface interactions. For example, TiO 2 was used to induce photocurrents in both p-type and n-type organic thin lm transistors under UV light in the opposite direction, 16 and induce a signicant UV and visible light photoresponse in graphene.…”

Highly sensitive and selective toluene sensor based on Ce-doped coral-like SnO2

“…The coral-like SnO 2 was prepared by hydrothermal treatment combined with an annealing process as we have reported in a previous research paper. 24 The crystal structure and morphology of SnO 2 were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The specic surface area and the average size of pores were obtained upon the multi-point Brunauer-Emmett-Teller (BET) analysis of N 2 sorption isotherms recorded at 77 K with a Nova 2000e surface area and pore size analyzer.…”

Embedding Pd into SnO2 drastically enhances gas sensing

“…As our focus is on understanding the partitioning of Pd between the surface and interior of SnO 2 and the subsequent impact on gas sensing, we benchmarked the sensitivity, the most basic property of gas sensors, at a commonly employed temperature, humidity and concentration of acetone and CO. Other sensor characteristics such as selectivity, stability and response and recovery times have not been investigated as they largely follow those of pure and Pd-containing SnO 2 sensors. The effect of sensing temperature, humidity and analyte concentration on the performance of SnO 2 -based sensors has been documented extensively for acetone 13,[15][16][17][18] and CO 11,16,[19][20][21][22] as summarized in Table S1 in the ESI. †…”