Enhanced Gas Sensing Properties of Pt-Loaded TeO₂Nanorods

Abstract

The NO2 gas sensing properties of multiple-networked, Pt-loaded TeO2 nanorod sensors were examined. Scanning electron microscopy revealed nanowires with diameters of 50-100 nm and lengths of a few micrometers. Transmission electron microscopy and X-ray diffraction showed that the nanrods were tetragonal-structured, single crystal TeO2. The Pt-loaded TeO2 nanorod sensors exhibited sensitivities of 11.00, 10.26, 11.23 and 11.97% at NO2 concentrations of 10, 50, 100 and 200 ppm, respectively, at 300 o C. These sensitivities were more than 10 times higher than those of bare-TeO2 nanorod sensors. The response times of the sensors were 310, 260, 270 and 230 sec at NO2 concentrations of 10, 50, 100 and 200 ppm, respectively. The recovery times of the Pt-loaded TeO2 nanorods were 390, 330, 335, and 330 sec at NO2 concentrations of 10, 50, 100 and 200 ppm, respectively. The origin of the enhanced sensing properties of the TeO2 nanorods by Pt loading is discussed.

Centimeter-Scale Tellurium Oxide Films for Artificial Optoelectronic Synapses with Broadband Responsiveness and Mechanical Flexibility

“…The measured lattice fringe of 0.48 nm corresponds to the interplanar spacing of α-TeO 2 (100) planes. 49,52 Figure 1f depicts the selected area electron diffraction (SAED) patterns with indexed diffraction spots corresponding to α-TeO 2 , 53 obtained from the sample in Figure 1e. Additional HRTEM images of other α-TeO 2 single-crystalline grains with (101) and ( 200) planes are presented in Supporting Information, Figure S5a, and a representative SAED pattern confirming the single crystallinity is displayed in Figure S5b.…”

Fabrication and NO2 gas sensing performance of TeO2-core/CuO-shell heterostructure nanorod sensors

“…The incorporation of a surface decoration or heterostructure formation technique can improve their sensing performance further. In this regard, a recent study reported the sensing properties of Pt-doped TeO 2 nanorods [16]. On the other hand, this paper reports the synthesis of TeO 2 -core/CuO-shell nanorods and the sensing properties of multiple networked TeO 2 -core/CuO-shell nanorod gas sensors toward NO 2 gas.…”

“…TeO 2 has applications in optical storage, laser devices and gas sensors, dosimeters, modulators, and deflectors owing to its unique properties such as high refractive index and high optical nonlinearity [16]. TeO 2 -nanostructured sensors have attracted less attention compared to other metal oxide semiconductor materials such as ZnO, In 2 O 3 , TiO 2 , Ga 2 O 3 , etc.…”

Enhanced room-temperature NO2gas sensing with TeO2/SnO2brush- and bead-like nanowire hybrid structures

“…Recent studies have reported an enhanced gas-sensing performance from the hierarchical assembly of semiconducting nanostructures through decoration of noble metals, selective metal oxides, and formation of localized p-n heterojunctions [7][8][9]. The low-temperature gas-sensing response stems primarily from a synergistic assembly of complementary building blocks of different surface states and morphologies [10][11][12][13][14][15][16][17][18][19][20][21]. One of our recent studies demonstrated an enhanced room-temperature gas-sensing performance at ppm levels from a novel brush-like p-Te/n-SnO 2 hybrid nanowire assembly [10].…”