Fast Response NO₂ Gas Sensor Based on In₂O₃ Nanoparticles

Abstract

In this research, hydrothermal-calcination route was applied to synthesize In 2 O 3 nanoparticles for gas sensor application. Hydrothermal synthesis with duration of 5 h at 180°C resulted in In(OH) 3 nanorods. Then, in the calcination step, considering controlled rate of heating and temperature, In 2 O 3 nanoparticles with rough surfaces were obtained. In the next step, these nanoparticles were deposited by low frequency AC electrophoretic deposition between the interdigitated electrodes to fabricate gas sensor. Deposition in the frequency of 10 kHz resulted in the chained nanoparticles in the interelectrode space. At the end, gas sensitivity measurements were conducted at 150°C-300°C and revealed that fabricated sensor had fast response and recovery times to NO 2 gas.S. Bhandarkar-contributing editor Manuscript No. 31711.

Crystal phase transformation and doping-induced blue emission of Eu-doped InOOH and cubic/corundum-type rhombohedral In2O3nanowires

“…Indium oxide IJIn 2 O 3 ), InIJOH) 3 and indium oxyhydroxide (InOOH) have been studied extensively owing to their wide applications in sensors, electronics and catalysts. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] To improve the efficiency of In-based materials, various morphologies have been synthesized using diverse synthetic methods with different solvents and additives, and at different temperatures. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] Interfacial wet chemical methods, such as hydrothermal, 11 solvothermal, 15,[21][22][23][24] sol-gel, 25 and precipitation methods, have favorably been used to obtain the following structures: nanocubes,...…”

“…39 Cubic and rhombohedralcoexisting In 2 O 3 was reported to show superior NO 2 sensing performance compared to pure c-In 2 O 3 nanostructures. 5,6 Corundum-type rh-In 2 O 3 was reported to show superior photocatalytic activity for the degradation of rhodamine B, methylene blue and phenol, compared to commercial c-In 2 O 3 . 15,16,59 Liu et al employed a simple ball milling method to convert c-In 2 O 3 to rh-In 2 O 3 , and found 8 times higher Li storage capability for rh-In 2 O 3 compared to c-In 2 O 3 .…”

Significantly enhanced temperature-dependent selectivity for NO2 and H2S detection based on In2O3 nano-cubes prepared by CTAB assisted solvothermal process

“…It is well known that morphology and microstructure of these metal oxides prominently influence their sensing properties. Therefore, there are many studies to synthesize various morphologies of In2O3 in order to detect NO2 or H2S gases, including nanowires [22], nanospheres [23], nanofibers [24], nanorods [7], nanosheets [25], nanoparticles [6,26,27], etc. However, most of these studies are focused on sensing one specific gas of either NO2 or H2S.…”

Electrochemical deposition of gold on indium zirconate (InZrOx with In/Zr atomic ratio 1.0) for high temperature automobile exhaust gas sensors

“…Zirconia is one of the most commonly used O2 and NOx sensing material [14][15][16], whereas indium oxide is a semiconductor oxide that is recently being used as active material in exhaust gas sensors [17][18][19].…”