No abstract

Graphitic carbon nitride (g-C N ) has been widely used in fields related to energy and materials science. However, nanostructured g-C N photocatalysts synthesized by traditional thermal polycondensation methods have the disadvantage of small specific surface areas and wide band gaps; these limit the catalytic activity and application range of g-C N . Based on the unique nanostructure of g-C N , it is a feasible method to modify g-C N with metals to design novel metal-semiconductor composites. Metals alter the photochemical properties of g-C N , in particular, narrow the band gap and expand photoabsorption into the visible range, which improves the photocatalytic performance. This review covers recent progress in metal/g-C N nanocomposites for photocatalysts, organic systems, biosensors, and so on. The aim is to summarize the synthetic methods, nanostructures, and applications of metal/g-C N nanocomposite materials, as well as discuss future research directions in these areas.

No abstract

No abstract

No abstract

In offline consumption, there will be sales staff to provide services for us, which also means that consumers need to communicate with sales staff. However, for some consumers who are nervous because they are afraid of others' negative evaluation of themselves in the social environment, they will be afraid to socialize with sales personnel, so they will prefer AI to provide services. Based on the consumer cognitive model, this paper explores the influence mechanism of negative evaluation fear on consumers' preference for AI services. The questionnaire data were collected online and offline, and SPSS was used to analyze the reliability and validity. A structural model was constructed to analyze the path and hierarchical regression to analyze the mediating effect. Finally, the conclusion was drawn that social anxiety would occur when consumers' fear of negative evaluation was high, Therefore, consumers will not think that they have a subjective preference for AI services. Enterprises should provide AI services for such consumers, so that they can get a better service experience.

No abstract