Effect of thickness on H2 gas sensitivity of SnO2 nanoparticle-based thick film resistors

Abstract

The effect of thickness on the p.p.m, level H2 gas sensitivity of SnO2 nanoparticle-based thick film resistors is reported. The nanoparticles are synthesized by a sol-gel method and the films are prepared using standard screen printing technology. The thickness of the films is varied from a few micrometers to a few hundred micrometers. The results indicate that the sample having thickness 76#m gives the maximum sensitivity. The mechanism of the change in sensitivity with thickness is discussed.

Mesoporous Silica Nanoparticles for Drug Delivery and Biosensing Applications

“…[45][46][47] The unique surface properties and the small particle sizes of these nanoparticle-based sensor systems allow for the detection of analytes within individual cells both in vivo and in vitro. [48] In particular, nanoparticles offer several advantages over homogeneous fluorescent and staining dyes.…”

Gas-sensing properties of sprayed films of (CdO)/sub x/(ZnO)/sub 1-x/ mixed oxide

“…Resistive-type sensors based on metal-oxide semiconductors have been intensively studied in the last decades due to the low cost, technological simplicity, small size, and ease of handling. Besides, thin-film gas sensors show high performance features such as high stability and fast response [1]- [3]. Furthermore, the compatibility with micromachined structures allows sensor miniaturization, reduction of the production cost, and power consumption.…”

Electrical Characterization of SnO2 based thick film resistors loaded with an optimized Sb: Sn alloy

“…The dried precipitate was ground into fine powder using agate mortar pestle and filtered through a 250 meshsize nylon cloth. The resulting powder was sintered/ calcined for 4hrs at various temperatures (500-1100 °C) to obtainSnO 2 fine particles of various sizes ranging from 28-50 nm 4 .Fine powders of antimony(Sb) and tin(Sn), both in particle size 5- …”

“…However thick film pastes/inks are based on expensive noble metals like Ru, RuO 2 , Pd, gold, etc. The Thick Film Resistors (TFRs) are superior in performance, such as stability against load, low thermal noise, high current carrying capacity, non-inductive in nature, could be used at high frequencies [1][2][3] .The cost effective SnO 2 nanoparticles can be easily synthesized by sol-gel method, may be used as a functional material in the composition of TFR pastes [4][5][6] . S.H.…”

“…Further Kattimani et al reported when Sb:Sn alloy loaded in SnO 2 results in sudden fall in sheet resistivity at 5 % of Sb:Sn doping from 10 12 Ω/□ to 750 Ω/□ followed by continuous steady decrease of resistivity and TCR at 90 % Sb:Sn alloy loading at 170 Ω/□ and TCR about -950 ppm/°c 9 . The research in nanoparticle physics is of interest due to high sensitivity for hydrogen, humidity, and LPG gas sensors [4][5][6]10 .It is interesting to study electrical properties in the variation of optimized Sb 0.6 :Sn 0.4 alloy of 5μm size loaded in SnO 2 nano-sized particles as cost effective thick film resistors. The fall in resistivity over the whole range of weight fraction W m in SnO 2 based thick films is predicted/expected to be similar to B. E. Springette's percolation model based on conducting particles mixed in uniform dielectric matrix 11 .…”