Bismuth-doped tin oxide thin-film gas sensors

Sberveglieri, G.; Groppelli, S.; Nelli, P.; Camanzi, A.

doi:10.1016/0925-4005(91)80004-4

Cited by 41 publications

(14 citation statements)

References 4 publications

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“…The energy band diagrams of the promoted heterojunctions based on the ZnO‐T with Bi 2 O 3 and on the ZnO‐T with Zn 2 SnO 4 semiconductors are depicted in Figure S12 (Supporting Information). From SEM, XRD, EDX, Raman, and sensing investigations, the following conclusions can be formulated: (i) p‐Bi 2 O 3 is well dispersed on the surface of ZnO‐T, giving rise to p‐p homojunctions between different ZnO‐T arms of the neighboring tetrapods, resulting in the p‐type gas sensing behavior of the samples; (ii) n‐Zn 2 SnO 4 micro‐ and nanostructures form additional Zn 2 SnO 4 ‐ZnO heterojunctions, which contribute to an improvement in the sensing properties of the samples …”

Section: Resultsmentioning

confidence: 99%

“…Consequently, the current through the HAL region decreases according to gas sensing investigations (see Figure c and Figure S11b, Supporting Information). Bi 2 O 3 p‐type materials and their composites have not been investigated as intensively as ZnO and SnO 2 , and only a few reports are available in the literature on their gas sensing behavior towards reducing gases. Very few studies have demonstrated good H 2 gas response at relatively high operating temperatures but with lower response speed, which could explain the improved sensing properties of the ZnO‐T‐Bi 2 O 3 hybrid 3D networks and the decrease in rapidity (speed of response) as compared to that of pure ZnO‐T 3D networks.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Multifunctional Materials: A Case Study of the Effects of Metal Doping on ZnO Tetrapods with Bismuth and Tin Oxides

Postica

Gröttrup

Adelung

et al. 2016

Adv Funct Materials

153

112

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Hybrid metal oxide nano-and microstructures exhibit novel properties, which make them promising candidates for a wide range of applications, including gas sensing. In this work, the characteristics of the hybrid ZnOBi 2 O 3 and ZnO-Zn 2 SnO 4 tetrapod (T) networks are investigated in detail. The gas sensing studies reveal improved performance of the hybrid networks compared to pure ZnO-T networks. For the ZnO-T-Bi 2 O 3 networks, an enhancement in H 2 gas response is obtained, although the observed p-type sensing behavior is attributed to the formed junctions between the arms of ZnO-T covered with Bi 2 O 3 and the modulation of the regions where holes accumulate under exposure to H 2 gas. In ZnO-T-Zn 2 SnO 4 networks, a change in selectivity to CO gas with high response is noted. The devices based on individual ZnO-T-Bi 2 O 3 and ZnO-T-Zn 2 SnO 4 structures showed an enhanced H 2 gas response, which is explained on the basis of interactions (electronic sensitization) between the ZnO-T arm and Bi 2 O 3 shell layer and single Schottky contact structure, respectively. Density functional theory-based calculations provide mechanistic insights into the interaction of H 2 and CO gas molecules with Bi-and Sn-doped ZnO(0001) surfaces, revealing changes in the Fermi energies, as well as charge transfer between the molecules and surface species, which facilitate gas sensing.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Multifunctional Materials: A Case Study of the Effects of Metal Doping on ZnO Tetrapods with Bismuth and Tin Oxides

Postica

Gröttrup

Adelung

et al. 2016

Adv Funct Materials

153

112

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“…Details on the experimental set-up can be found elsewhere [11] . The sensor was exposed to an UV lamp (Amax =365 nm, 0.5 flW/mm2) with an emission spectra reported in Fig.…”

Section: Methodsmentioning

confidence: 99%

Photoactivation of Semiconductor Gas Sensors Operating at Room Temperature

Comini¹,

Faglia²,

Sberveglieri³

2003

Advanced Gas Sensing - The Electroadsorptive Effect and Related Techniques

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“…These include ultrahigh vacuum and reactive electron beam evaporation [3][4][5][6][7][8][9][10], chemical vapor deposition (CVD) by thermal, plasma or laser technique [11][12][13], reactive radio-frequency (RF) or magnetron sputtering [14][15][16][17][18][19][20][21][22][23][24][25][26], laser ablation [27][28][29][30][31][32], the sol-gel technique [32][33][34][35][36], screen printing technology [37,38], electrochemical deposition [7,39], and pyrosol methods [40][41][42][43]. Various techniques have been used for the deposition of the gas-sensitive layer.…”

Section: Introductionmentioning

confidence: 99%