Self-Assembled SnO2/SnSe2Heterostructures: A Suitable Platform for Ultrasensitive NO2and H2Sensing

Valentina Paolucci, Gianluca D'Olimpio, Chia Nung Kuo, Chin Shan Lue, Danil W. Boukhvalov, Carlo Cantalini, Antonio Politano

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)


By means of experiments and theory, the gas-sensing properties of tin diselenide (SnSe2) were elucidated. We discover that, while the stoichiometric single crystal is chemically inert even in air, the nonstoichiometric sample assumes a subnanometric SnO2 surface oxide layer once exposed to ambient atmosphere. The presence of Se vacancies induces the formation of a metastable SeO2-like layer, which is finally transformed into a SnO2 skin. Remarkably, the self-assembled SnO2/SnSe2-x heterostructure is particularly efficient in gas sensing, whereas the stoichiometric SnSe2 sample does not show sensing properties. Congruently with the theoretical model, direct sensing tests carried out on SnO2/SnSe2-x at an operational temperature of 150 C provided sensitivities of (1.06 ± 0.03) and (0.43 ± 0.02) [ppm]-1 for NO2 and H2, respectively, in dry air. The corresponding calculated limits of detection are (0.36 ± 0.01) and (3.6 ± 0.1) ppm for NO2 and H2, respectively. No detectable changes in gas-sensing performances are observed in a time period extended above six months. Our results pave the way for a novel generation of ambient-stable gas sensor based on self-assembled heterostructures formed taking advantage on the natural interaction of substoichiometric van der Waals semiconductors with air.

頁(從 - 到)34362-34369
期刊ACS Applied Materials and Interfaces
出版狀態Published - 2020 七月 29

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

指紋 深入研究「Self-Assembled SnO<sub>2</sub>/SnSe<sub>2</sub>Heterostructures: A Suitable Platform for Ultrasensitive NO<sub>2</sub>and H<sub>2</sub>Sensing」主題。共同形成了獨特的指紋。