In this research, we report on the synthesis of Au/g-C3N4 material and study the effect of Au deposition on g-C3N4to optimize its photocatalytic performance. The presence of Au significantly enhances the light absorption and reduces the recombination rate of electron-hole pairs leading to improve the H2 evolution efficiency. The highly improved efficiency is also due to the efficient transfer of photoelectrons between the g-C3N4and Au molecules. The report indicates that the chemical reduction method to deposit gold nanoparticles on g-C3N4is an appropriate method with significant photocatalytic efficiency. The results open up another path for the synthesis of Au/g-C3N4for hydrogen evolution applications.
In this report, poly(1,8-diaminonaphthalene) as a molecularly imprinted polymer (MIP) coated on gold nanoparticles (nano Au) dispersed on ITO electrode was prepared. While nano Au strongly enhance the Raman signal of the analyte, MIP layer allows to selective trap and enrich the analyte molecules close to the Au surface. In fact, by building a polymer matrix around target molecules, in this case is rhodamine B and then extraction of the imprinted molecules, we can create the specific cavities in the MIP shell with a 3D structure complementary to the template molecule in shape and chemical functionality. The rhodamine molecules on ITO/Au/MIP substrate were detected using surface-enhanced Raman spectroscopy (SERS) with an enhancement factor of 106. The SERS peak intensity at 611 and 771 cm-1 was found to be proportional to the Rhodamine concentration with correlation coefficients of 0.993 and 0.935, respectively. These results open up prospects for development of poly(1,8-diaminonaphthalene) as a molecularly imprinted polymer for applications in plasmonic sensing.
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