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In this study, we report the hydrogen sensing properties of the Pt dispersed graphitic carbon nitride (g-C 3 N 4) nanocomposite at room temperature and inert atmosphere. The nanocomposite was synthesized by a wet-chemical approach, where melamine and chloroplatinic acid hexahydrate were used as precursors. The fabrication of the sensor was done by jet nebulizer-based spray pyrolysis setup. Various characterizations were performed for the analysis of the synthesized nanocomposite. Electrical resistance in the presence and absence of the analyte gas was drastically different. The results at different concentrations and film thickness show Pt/g-C 3 N 4 to possess good sensitivity towards the hydrogen gas, suggesting that it could be used for reliable hydrogen gas sensing. • Cost-effective Nebulized spray pyrolysis is adopted for the film fabrication. • First time this material is explored for the gas sensing. • Improvement in the gas sensing with respect to film thickness is examine. • Uniform film with ease in deposition process is introduced. • Fast response and recovery time with efficient hydrogen sensing was performed. [ABSTRACT FROM AUTHOR]

Nanoparticles of palladium (Pd) were incorporated into graphitic carbon nitride (g-C 3 N 4) matrix with a view to improving hydrogen sensing efficiency of g-C 3 N 4 , by a fairly new chemical process that uses ammonium tetrachloropalladate as a Pd metal nanoparticle source along with an appropriate reducing agent. Researchers have explored g-C 3 N 4 for various applications such as a catalyst for water splitting, photoluminescence, storage because of its relatively low cost, easy synthesis, and ready availability. For the synthesis of g-C 3 N 4 , urea was used as a precursor at 550 °C and at atmospheric pressure under a muffle furnace without add-on support. The final solution of the Pd/g-C 3 N 4 nanocomposite was then centrifuged and dried for use as a hydrogen-sensing material. g-C 3 N 4 and Pd/g-C 3 N 4 were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), UV-VIS-NIR spectroscopy, Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), and energy dispersive X-ray spectroscopy (EDS). Pd-dispersed graphitic carbon nitride film was deposited on an inter digited carbon electrode by using a screen printing technique. From the qualitative analysis by I–V measurement, a significant change in the resistance was observed during the presence and absence of the hydrogen gas. The results show Pd/g-C 3 N 4 nanocomposite as an efficient hydrogen sensing material. Image 1 • Pd/g-CN was first time synthesized by a fairly new chemical process. • Pd/g-CN based hydrogen sensor was fabricated using low cost screen printing technique. • Significant material resistance (KΩ) was determined which is better than the previously reported data in the literature. • Pd/g-CN nanocomposite with average Pd metal nanoparticle size around 4 nm was obtained which is remarkable. [ABSTRACT FROM AUTHOR]