Nano Ag-DopedIn2O3Thick Film: A Low-TemperatureH2S

Abstract

Thick films of AR grade In2O3were prepared by standard screen-printing technique. The gas sensing performances of thick films were tested for various gases. It showed maximum sensitivity to ethanol vapour at 350°C for 80 ppm concentration. To improve the sensitivity and selectivity of the film towards a particular gas, In2O3sensors were surface-modified by dipping them in a solution of 2% nanosilver for different intervals of time. Obtained results indicated that spherical nano-Ag grains are highly dispersed on the surface of In2O3sensor. The surface area of the nano-Ag/ In2O3sensor is several times larger than that of pure In2O3sensor. In comparison with pure In2O3sensor, all of the nano-Ag-doped sensors showed better sensing performance in respect of response, selectivity, and optimum operating temperature. The surface-modified (30 min) In2O3sensor showed larger sensitivity to H2S gas (10 ppm) at 100°C. Nano silver on the surface of the film shifts the reactivity of film from ethanol vapour to H2S gas. A systematic study of gas sensing performance of the sensor indicates the key role played by the nano silver species on the surface. The sensitivity, selectivity, response, and recovery time of the sensor were measured and presented.

A silver nanoparticle-anchored UiO-66(Zr) metal–organic framework (MOF)-based capacitive H2S gas sensor

“…6. 48,49 Ag2O NPs increased the adsorption of H2S gas molecules on the surface of MOF due to catalytic effect and formation of Ag2S.…”

Ag-decorated ultra-thin porous single-crystalline ZnO nanosheets prepared by sunlight induced solvent reduction and their highly sensitive detection of ethanol

“…However, the detection limits of traditional metal oxide gas sensors can only reach ppm level [5,6]. Their performances are significantly influenced by morphology and structure of the sensing materials, therefore nanostructured metal oxides have been developed to improve gas sensing properties in sensitivity, selectivity and response speed [7][8][9][10].…”

Preparation and Characterization of Zirconia Based Thick Film Resistor as a Ammonia Gas Sensor

“…Now days it is mostly used to detect toxic gases and other gases applicable in mines [1] air cabins, [2] medication, [3] space, for cooking purposes in homes and hotels and Automobiles [4][5][6] etc. Such as H 2 , CO 2 , CO, NO 2 , NO X , CH 4 , H 2 S, SO 2 , O 2 , NH 3 , C 2 H 5 OH, LPG etc.…”

“…Now days it is mostly used to detect toxic gases and other gases applicable in mines [1] air cabins, [2] medication, [3] space, for cooking purposes in homes and hotels and Automobiles [4][5][6] etc. Such as H 2 , CO 2 , CO, NO 2 , NO X , CH 4 , H 2 S, SO 2 , O 2 , NH 3 , C 2 H 5 OH, LPG etc. [7][8][9] The main advantages of the thin and thick film sensors are simple construction, small size, good sensitivity and selectivity, quick response and fast recovery time, low operating temperature, high stability, good accuracy, easy processing, reproducibility, low Cost and low consumption Pure zirconia (ZrO 2 ) is not used in any practical application.…”