Synthesis of a Flower-Like g-C3N4/ZnO Hierarchical Structure with Improved CH4 Sensing Properties

Abstract

In this paper, a hierarchical structure of graphite carbon nitride (g-C3N4) modified ZnO (g-C3N4/ZnO) was synthesized using a simple precipitation-calcination method. Through this method, g-C3N4 nanosheets with a controlled content were successfully decorated on the petals of flower-like ZnO. Various techniques were used to confirm the successful formation of the g-C3N4/ZnO hierarchical structure. The methane (CH4) sensing properties of g-C3N4/ZnO sensor were investigated. The result exhibited that after decorating ZnO with g-C3N4, the CH4 sensing performances of the fabricated sensor were remarkably improved. At the optimum operating temperature of 320 °C, the response of the sensor fabricated with CNZ-3 (the sample with an optimum content of g-C3N4) towards 1000 ppm CH4 was as high as 11.9 (Ra/Rg), which was about 2.2 times higher than that of the pure ZnO sensor (5.3). In addition, the CNZ-3 sensor also exhibited a fast response/recovery speed (15/28 s) and outstanding long-term stability. The enhancing CH4 sensing mechanism may be contributed to enlarged surface area, pore structure, and g-C3N4-ZnO n-n junction.

Design and development of highly sensitive PEDOT-PSS/AuNP hybrid nanocomposite-based sensor towards room temperature detection of greenhouse methane gas at ppb level

“…The chemiresistive sensor fabricated in this study shows excellent gas response of $8.6 (760% sensitivity) at 1000 ppb concentration of methane gas. The sensors fabricated in the present study demonstrates excellent features towards methane gas detection in low concentrations at room temperatures in comparison to recent studies [42][43][44][45][46][47][48][49][50][51][52] as summarized in Table 2. To the best of our knowledge this is the rst study reported with such a high performance for room temperature detection of greenhouse methane gas at ppb level.…”

Influence of High Temperature Synthesis on the Structure of Graphitic Carbon Nitride and Its Hydrogen Generation Ability

“…Over the last few years, much effort has been focused on the search of methods for enhancement of photocatalytic activity of carbon nitride. Attempts have been made to increase its specific surface area (SSA) using the hard template method [11,[16][17][18][19][20][21] and to reduce the energy specific surface area (SSA) using the hard template method [11,[16][17][18][19][20][21] and to reduce the energy gap by doping with heteroatoms [22][23][24][25][26][27][28] or exfoliation [29,30]. Although these methods have been proved as effective, they are multistage and thus expensive.…”

CuS nanoparticles anchored to g-C3N4 nanosheets for photothermal ablation of bacteria

“…During the past few years, many research groups have reported different types of heterojunction photocatalysts comprised of g-C 3 N 4 and metal oxides or sulphides showing improved photothermal conversion efficiencies when compared with their individual components. 32,[35][36][37][38][39] Inspired by the above efforts, we herein construct a selfassembled PTT agent, PEG-CuS@g-C 3 N 4 by a rapid and simple recrystallization growth which was schematically illustrated in Scheme 1. In this composite, CuS played a role in generating hyperthermia under the NIR irradiation.…”