Ultrasensitive Formaldehyde Sensor Based on SnO2 with Rich Adsorbed Oxygen Derived from a Metal Organic Framework

被引：49

作者：

Deng, Zongming ^{[1
]}

Zhang, Yumin ^{[1
]}

Xu, Dong ^{[1
]}

Zi, Baoye ^{[1
]}

Zeng, Jiyang ^{[1
]}

Lu, Qiang ^{[1
]}

Xiong, Kai ^{[1
]}

Zhang, Jin ^{[1
]}

Zhao, Jianhong ^{[1
]}

Liu, Qingju ^{[1
]}

机构：

[1] Yunnan Univ, Natl Ctr Int Res Photoelect & Energy Mat, Sch Mat & Energy, Yunnan Key Lab Micro Nano Mat & Technol, RChina, Kunming 650091, Peoples R China

来源：

ACS SENSORS | 2022年 / 7卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Sn-MOF; SnO2; gas sensor; formaldehyde detection; rich oxygen vacancy; HIERARCHICAL SNO2; CONDUCTION MODEL; HIGH-SENSITIVITY; GRAIN-SIZE; GAS SENSOR; NANOPARTICLES; HUMIDITY; ENERGY; ANODE; HETEROJUNCTION;

D O I：

10.1021/acssensors.2c00589

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

SnO2 has been a commonly researched gas-sensing material due to its low cost, good performance, and good stability. However, gas sensors based on pure SnO2 usually show a low response or high working temperature. In this work, laminar SnO2 was obtained by using a Sn-based metal organic framework(Sn-MOF)@SnO2 as a precursor. Sn-MOF@SnO2 is prepared at low temperatures using water and dimethylformamide as a solvent, which is simple, low cost, and easily reproducible. After sintering, Sn-MOF@SnO2 is derived to SnO2 with rich adsorbed oxygen, large specific surface area, and unique nanoparticle piled pores, thus showing excellent gas-sensing properties. The prepared SnO2 has an ultrahigh response value of 10,000 to 10 ppm formaldehyde at an optimal working temperature of 120 degrees C, a fast response/ recovery time of 33 s/142 s, and an actual detection limit of lower than 10 ppb as well as high selectivity and high stability. Density functional theory calculations show that the exposed (110) plane of oxygen-rich vacancies in laminar SnO2 can effectively increase the coadsorption capacity of O2 and formaldehyde molecules, thereby improving the formaldehyde gas-sensing performance of the material. The present original approach paves the way to design advanced materials with excellent gas-sensing properties as well as broad application prospects in formaldehyde monitoring.

引用

页码：2577 / 2588

页数：12

共 69 条

[1]

Anisimov ON, 2005, SIBCON-2005: IEEE International Siberian Conference on Control and Communications, P63

[2] 46th ESAO Congress 3-7 September 2019 Hannover, Germany Abstracts [J].