Details

Autor(en) / Beteiligte

• Purbia, Rahul
• Kwon, Yeong Min
• Kim, Hong-Dae
• Lee, Yun Sik
• Shin, Heungjoo
• Baik, Jeong Min

Titel

Zero-dimensional heterostructures: N-doped graphene dots/SnO for ultrasensitive and selective NO gas sensing at low temperatures

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2020-06, Vol.8 (23), p.11734-11742

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• To enable the sensitive and selective monitoring of NO 2 gas at low ppb concentrations, zero-dimensional N-doped graphene dot/SnO 2 quantum dot (N-GD-SnO 2 ) heterostructures are prepared via a simple wet-chemical method. In comparison with pristine-SnO 2 , our fabricated device exhibits an enhanced response ( R g / R a = 292) with a short response (181 s) and recovery time (81 s) toward 100 ppb NO 2 gas at 150 °C; furthermore, the response increases to 4336 as the temperature decreases to 50 °C. The sensor also exhibits the distinct capability to detect NO 2 with an ultralow concentration of 20 ppb with high response. This dramatic enhancement is attributed to enhanced electron transfer from SnO 2 to N-GDs and stronger adsorption of NO 2 molecules onto the N-GDs' surface. Additionally, zero-dimensional morphology also helped to enhanced sensing performance due to large surface area, more active sites, and better nanoscale interface. Finally, the sensor exhibits the characteristics of excellent selectivity toward NO 2 over other gases (SO 2 , H 2 S, CO, and NH 3 ). Thus, our research provides a new approach toward zero-dimensional heterostructures for gas-sensing applications. Facile synthesis of zero-dimensional heterostructures consisting of N-doped graphene quantum dots (N-GDs) and SnO 2 nanoparticles is reported for the NO 2 gas sensor with high sensitivity and excellent selectivity.