Details

Autor(en) / Beteiligte

• Hu, Jing
• Zou, Cheng
• Su, Yanjie
• Li, Ming
• Yang, Zhi
• Ge, Meiying
• Zhang, Yafei

Titel

One-step synthesis of 2D C3N4-tin oxide gas sensors for enhanced acetone vapor detection

Ist Teil von

• Sensors and actuators. B, Chemical, 2017-12, Vol.253, p.641-651

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] Facile prepared heterostructural C3N4-SnO2 nanocomposite of enhanced acetone sensing properties based on low-cost and eco-friendly materials. •2D C3N4-SnO2 was prepared by one-step method with excellent sensing properties.•SnO2 nanoparticles directly anchor on C3N4 layer to construct heterostructure.•22 times sensing enhancement and fast response/recovery (7s/8s) were presented.•The LOD of acetone low to 67ppb predict a possible for diagnosis of diabetes.•A new mechanism has been proposed to explain the sensing enhancement. This work proposed a one-step method to fabricate the two-dimensional (2D) heterostructural C3N4-tin oxide (SnO2) nanocomposites with excellent acetone vapor sensing performance. A facile calcination treatment of melamine and SnCl2·2H2O without further processing can obtain the expected C3N4-SnO2 sensor. Specially, the SnO2 nanoparticles directly anchor onto C3N4 layer to construct a heterostructure, giving enhanced sensing properties. Compared with pure SnO2 the heterostructural C3N4-SnO2 Exhibits 22 times enhancement of sensing sensitivity as well as fast response/recovery (7s/8s). The limit of detection (LOD) of acetone can be as low as 67ppb, which is far below the concentration in exhaled breath of a diabetic and predicts a possible for diagnosis of diabetes. Such enhancement can be interpreted as the transformation of electrons from SnO2 to C3N4 layer to form an asymmetric electronic structure in the electron depletion layer of SnO2, for which few electrons can change its resistance significantly. Moreover, the large surface area of C3N4 layer provide vast adsorption sites for target gases. Importantly, SnO2 and C3N4 are low-cost, easy fabrication and eco-friendly materials, and the synthesis strategy presented here is simple, repeatable and operable, thus can be extended to build other-type metal oxides-based nanocomposites for various applications.