Hierarchical α-Fe2O3/SnO2 semiconductor composites: Hydrothermal synthesis and gas sensing properties

Sun, Peng; Cai, Yaxin; Du, Shichao; Xu, Xiumei; You, Long; Ma, Jing; Liu, Fengmin; Liang, Xishuang; Sun, Yanfeng; Lu, Geyu

doi:10.1016/j.snb.2013.03.019

Cited by 132 publications

(47 citation statements)

References 41 publications

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“…Thus, introducing metal nitrides into metal oxides could tune electrical properties that have great influence on gas sensing characteristics, such as carrier mobility and electrical resistivity [16]. In addition, other reports have demonstrated that establishing heterojunction could largely decrease the working temperature of sensing materials [17][18][19]. Thus, designing composites consisting of metal nitrides and oxides, and innovatively applying the composites as gas sensor materials, is of vital significance.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous WN/WO3-Composite Nanosheets for the Chemiresistive Detection of NO2 at Room Temperature

Guarecuco

et al. 2016

Inorganics

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Abstract:Composite materials, which can optimally use the advantages of different materials, have been studied extensively. Herein, hybrid tungsten nitride and oxide (WN/WO 3 ) composites were prepared through a simple aqueous solution route followed by nitriding in NH 3 , for application as novel sensing materials. We found that the introduction of WN can improve the electrical properties of the composites, thus improving the gas sensing properties of the composites when compared with bare WO 3 . The highest sensing response was up to 21.3 for 100 ppb NO 2 with a fast response time of 50 s at room temperature, and the low detection limit was 1.28 ppb, which is far below the level that is immediately dangerous to life or health (IDLH) values (NO 2 : 20 ppm) defined by the U.S. National Institute for Occupational Safety and Health (NIOSH). In addition, the composites successfully lower the optimum temperature of WO 3 from 300˝C to room temperature, and the composites-based sensor presents good long-term stability for NO 2 of 100 ppb. Furthermore, a possible sensing mechanism is proposed.

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Section: Introductionmentioning

confidence: 99%

Mesoporous WN/WO3-Composite Nanosheets for the Chemiresistive Detection of NO2 at Room Temperature

Guarecuco

et al. 2016

Inorganics

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“…Superior properties accompanied by the compositon and architecture of components have attracted considerable attention. As important semiconductors, Fe 2 O 3 /SnO 2 composite has been intensively investigated as candidates for gas sensors [1][2][3], catalysts [4][5][6][7][8], electrode materials [9,10] and so on. It was found that Fe 2 O 3 /SnO 2 composite materials showed higher catalytic activity and sensor signal than pure SnO 2 and Fe 2 O 3 [1][2][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Preparation and magnetic properties of NiFe2O4–Fe2O3@SnO2 heterostructures

et al. 2015

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“…SnO 2 has been extensively applied as a gas-sensing material because of its high conductivity and good stability [1,2]. The sensing mechanism of SnO 2 is categorized as surface-control type, in which the grain sizes, surface states, and oxygen adsorption quantities have important roles in gas sensing [3].…”

Section: Introductionmentioning

confidence: 99%