Carbon Nitride Decorated Ball-Flower like Co3O4 Hybrid Composite: Hydrothermal Synthesis and Ethanol Gas Sensing Application

Abstract

Recently, semiconducting metal oxide (SMO) gas sensors have attracted the attention of researchers for high conductivity, labile features by environment, low cost, easy preparation, etc. However, traditional SMOs have some defects such as higher operating temperature and lower response value, which greatly limit their application in the field of gas sensor. In this work, the carbon nitride decorated ball-flower like Co3O4 composite was successfully synthesized via a facile hydrothermal method, the composition and morphology of the as-synthesized samples were studied by the techniques of X-ray powder diffraction (XRD), Field-emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM), Fourier transform infrared spectrometer (FT-IR) and N2-sorption. As a consequence, the pure Co3O4 and the carbon nitride decorated Co3O4 both possess ball-flower like structure, and the as-synthesized carbon nitride decorated Co3O4 composite exhibits significant sensing properties to ethanol which is 1.6 times higher than that of pure Co3O4, furthermore, the composite possesses high selectivity and stability towards ethanol detection.

Expanded graphite/NiAl layered double hydroxide nanowires for ultra-sensitive, ultra-low detection limits and selective NOx gas detection at room temperature

“…Ye et al 11 obtained graphene nanoplate (GN)-polyaniline (PANI) composites through in situ polymerization, which exhibited good sensor response for 100 ppm NH 3 at RT (15 ppm, $1.5%). Gong et al 12 successfully synthesized a g-C 3 N 4 modied ball-ower like Co 3 O 4 composite (Co 3 O 4 /pCNH) by a simple hydrothermal method. It was found that the Co 3 O 4 /pCNH composites exhibited a very high response to ethanol gas at 210 C (500 ppm, $30.2%).…”

“…EG and g-C 3 N 4 are ideal atomic thickness 2D substrates for anchoring nanomaterials. 12,13 In our previous work, EG was used as a substrate to synthesize CeO 2 / graphene nanoower composites. The sensitivity of CeO 2 / graphene composites for 100 ppm NO x was 10.39% at RT.…”

Ultrasonic-Assisted Synthesis of 2D α-Fe2O3@g-C3N4 Composite with Excellent Visible Light Photocatalytic Activity

“…Deionized water was used in this work. The nanosheets of 2D g-C 3 N 4 and hexagonal 2D α-Fe 2 O 3 were synthesized according to previously reported methods [33][34][35]. In a typical synthesis, the 2D α-Fe 2 O 3 @g-C 3 N 4 photocatalyst was prepared using an ultrasonic assisted self-assembly method.…”

Highly Sensitive Acetone Gas Sensor Based on g-C3N4 Decorated MgFe2O4 Porous Microspheres Composites

“…Several previous studies focusing on g-C 3 N 4 decorated various metal oxide composites proved that g-C 3 N 4 plays a very important role in the composites. It not only enlarges the specific surface area and prevents agglomeration of metal oxide nanoparticles, but also forms a heterojunction with MOSs and provides new chemical and structural properties [25,26,27]. Cao et al reported that SnO 2 /g-C 3 N 4 nanocomposites show a favorable response to ethanol by a facile calcination method [28].…”