Enhanced formaldehyde sensitivity of two-dimensional mesoporous SnO2 by nitrogen-doped graphene quantum dots

• 作者: Zhen-Lu Chen Ding Wang Xian-Ying Wang Jun-He Yang
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: ADVANCED NANOMATERIALS FOR GAS AND HUMIDITY SENSORS
• 页码范围: 1561-1570
• 页数: 10页
• 语种: 英文

摘要

Formaldehyde (HCHO) is widely known as an indoor air pollutant,and the monitoring of the gas has significant importance.However,most HCHO sensing materials do not have low detection limits and operate at high temperatures.Herein,two-dimensional (2D) meso-porous ultrathin SnO2 modified with nitrogen-doped gra-phene quantum dots (N-GQDs) was synthesized.The N-GQDs/SnO2 nanocomposite demonstrated high effi-ciency for HCHO detection.With the addition of 1.00 wt％N-GQDs,the response (Ra/Rg) of SnO2 gas sensor increased from 120 to 361 at 60 ℃ for the detection of 10 × 10-6 HCHO.In addition,the corresponding detec-tion limit was as low as 10 × 10-9.Moreover,the sensor exhibited excellent selectivity and stability for the detec-tion of HCHO.The enhanced sensing performance was attributed to both the large specific surface area of SnO2 and electron regulation of N-GQDs.Therefore,this study presents a novel HCHO sensor,and it expands the research and application potential of GQDs nanocomposites.