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A High‐Performance Nitro‐Explosives Schottky Sensor Boosted by Interface Modulation
Author(s) -
Yang Zheng,
Dou Xincun,
Zhang Shengli,
Guo Linjuan,
Zu Baiyi,
Wu Zhaofeng,
Zeng Haibo
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201501120
Subject(s) - trinitrotoluene , materials science , schottky barrier , explosive material , optoelectronics , graphene , heterojunction , nanotechnology , schottky diode , oxide , modulation (music) , chemistry , organic chemistry , philosophy , diode , metallurgy , aesthetics
A high‐performance Schottky sensor boosted by interface modulation is fabricated for the detection of trace nitro‐explosives vapors. The interface modulation strategy results in a silicon nanowires (SiNWs) array/TiO 2 /reduced graphene oxide (rGO) sensor with sensitive and selective response toward nitro‐explosives vapors. The response of the SiNWs array/TiO 2 /rGO sensor toward nitro‐explosives vapors, such as 9 ppb 2,4,6‐trinitrotoluene, 4.9 ppt hexogen, and 0.25 ppq octagon, is boosted by 2.4, 7.5, and 5 times with the insertion of TiO 2 . Superior selectivity is shown even compared with interfering gases of 10 ppm. Such good sensing performance can be attributed to the good sensing performance of the Schottky heterojunction‐based sensor, the Schottky barrier height modulation with the insertion of TiO 2 , SiNWs array structure enhanced diffusion, and TiO 2 nanoparticles enhanced adsorption. This is believed to be the first Schottky heterojunction‐based sensor for nitro‐explosives vapors detection. This work would open a new way to develop highly sensitive and selective sensors.