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This sensor was used to detect the concentration of Cu2+ ions in lake water with satisfactory results. The nanosensor was developed by using a simple mixture of AuNCs and WS2-QDs without necessary fabrication of silica microspheres.

With the continuous improvement of the income level of Chinese residents and the popularity of coffee culture among Chinese consumers, the annual coffee consumption in the Chinese market continues to rise. More and more coffee brands are entering the market, intensifying market competition. Large chain brands, represented by Starbucks, have gradually occupied an absolute leading position in the fierce market competition. JDE Peet's is the father of Starbucks, but it is a new player in the Chinese market. Therefore, this paper is guided by the research results of the coffee industry in the world and the Chinese market, adopts the SWOT analysis method and analyzes the company's financial data to analyze Peet's business status, existing problems, internal and external environment, and its own advantages and disadvantages in the Chinese market. Through analysis, it is found that although Peet's has gradually opened up the consumer market in big cities such as Beijing and Shanghai in China, the market is still too narrow, and there is no strong competitiveness, and there are still a series of brand positioning that is not accurate and clear. In the face of strong Starbucks and Luckin Coffee, it is obviously impossible to win in the market competition. Therefore, JDE Peet's doesn't currently have big investment value.

The rational design of covalent organic framework (COF) based hybrid materials is of paramount importance to address the fundamental challenges of COFs with respect to their poor electron mobilization and the limited number of accessible active sites. Herein, we propose a new strategy for the fabrication of covalently bonded COF grafted graphene aerogel hybrid materials for electrocatalytic application. An