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Tunable MoS2/SnO2 P–N Heterojunctions for an Efficient Trimethylamine Gas Sensor and 4-Nitrophenol Reduction Catalyst
- Qiao, Xiu-Qing, Zhang, Zhen-Wei, Hou, Dong-Fang, Li, Dong-Sheng, Liu, Yunlin, Lan, Ya-Qian, Zhang, Jian, Feng, Pingyun, Bu, Xianhui
- ACS sustainable chemistry & engineering 2018 v.6 no.9 pp. 12375-12384
- catalysts, catalytic activity, energy, molybdenum, molybdenum disulfide, nanofibers, nanosheets, p-nitrophenol, tin, tin dioxide, trimethylamine
- Synthetic design and construction of P–N heterojunctions are attracting increasing attention due to their potential applications such as in catalysis, gas sensors, and energy storage and conversion. In general, the design strategies of P–N heterojunctions target one specific property. The construction of multifunctional materials with different functions remains an interesting and challenging research pursuit. Especially, multifunctional properties switched within a given chemical combination have rarely been found. Herein, by adjusting the mole ratio between MoS₂ and SnO₂, the first bifunctional MoS₂/SnO₂ P–N heterojunctions have been realized within a particular chemical system. As a result of the combination of MoS₂ nanosheets and SnO₂ nanofibers, MoS₂/SnO₂ heterojunctions exhibit great potential in both gas sensors and catalysts. With low loading of MoS₂ (molar ratio, Mo/Sn = 0.53), the P–N heterojunction exhibits superior sensing selectivity and long-term stability toward trimethylamine. With increased MoS₂ amount, the P–N heterojunctions display very good catalytic activities for 4-nitrophenol reduction. The bifunctional MoS₂/SnO₂ P–N heterojunctions with high sensitivity, selectivity, stability, and catalytic activity are promising candidates for practical applications. It can be anticipated that the synthetic strategy reported here will create new opportunities for realizing multifunctional materials by the rational design of P–N heterojunctions.