Laser-ablated violet phosphorus/graphene heterojunction as ultrasensitive ppb-level room-temperature NO sensor  

作　　者：Xiaohui Ye Ming Qi Hao Qiang Mengzhen Chen Xi Zheng Mengyue Gu Xuewen Zhao Yanling Yang Chaozheng He Jinying Zhang 

机构地区：[1]School of Material Science and Engineering,Shaanxi University of Science and Technology,Xi’an 710021,China [2]Center of Nanomaterials for Renewable Energy(CNRE),School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China [3]Institute of Environmental and Energy Catalysis,School of Materials Science and Chemical Engineering,Xi’an Technological University,Xi’an 710021,China

出　　处：《Chinese Chemical Letters》2023年第9期248-253,共6页中国化学快报（英文版）

基　　金：the funding support by National Natural Science Foundation of China(Nos.61705125,22175136);Open Foundation of State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures,Guangxi University(No.2022GXYSOF15)。

摘　　要：Two dimensional(2D)materials are promising gas sensing materials,but the most of them need to be heated to show promising sensing performance.Sensing structures with high sensing performance at room-temperature are urgent.Here,another 2D material,violet phosphorus(VP)nanoflake is investigated as gas sensing material.The VP nanoflakes have been effectively ablated to have layers of 1–5 layers by laser ablation in glycol.The VP nanoflakes are combined with graphene to form VP/G heterostructuresbased NO sensor.An ultra-high gauge factor of 3×10^(7)for ppb-level sensing and high resistance response of 59.21%with ultra-short recovery time of 6s for ppm-level sensing have been obtained.The sensing mechanism is also analysed by density functional theory(DFT)calculations.The adsorption energy of VP/G is calculated to be-0.788 e V,resulting in electrons migration from P to N to form a P-N bond in the gap between VP and graphene sheet.This work provides a facile approach to ablate VP for mass production.The as-produced structures have also provided potential gas sensors with ultrasensitive performance as ppb-level room-temperature sensors.

关 键 词：Laser ablation Violet phosphorus nanoflakes Heterostructures ppb level NO sensor 

分 类 号：TB34[一般工业技术—材料科学与工程] TP212[自动化与计算机技术—检测技术与自动化装置]