(a) Resistance transformation mechanism of silver selenide nanoribbons, (b) In situ SEM characterization of silver migration and wire formation in nanoribbons between electrodes Recently, Liu Jinhuai and Huang Xingjiu, research fellows of the Institute of Nano-Materials and Environmental Detection at the Institute of Intelligent Mechanics of the Chinese Academy of Sciences' Institute of Materials Science, have made new progress in the research of resistance-switched nanodevices. Related research results have been received and published by Small (DOI: 10.1002/smll.201501689). Chalcogenide nanomaterials are one of the hot topics in the research of photovoltaic nanodevices. Especially in the resistance conversion device, due to its high density, fast response to electrical storage and other characteristics has a good application prospects. However, the existing conventional synthesis methods limit the preparation of novel nanostructures of such materials. For example, the silver selenide nanoribbon structure has rarely been reported so far, and it is unfavorable for the development of novel nanodevices. In recent years, ion exchange as an ancient technology has attracted much attention in the construction of new nanostructures. Because its reaction is controlled by the kinetics, its composition can be changed while maintaining the nanostructure of the template effectively. Therefore, on the basis of the existing synthesis methods of nanomaterials, the ion exchange method greatly enriches the structure and morphology of nanomaterials. Based on this, Guo Zheng, a research associate of the research group, for the first time realized the preparation of silver selenide nanoribbons by synthesizing zinc selenide nanobelts and using them as templates for exchange with Ag+. Combined with the LB film self-assembly technology, the researchers further realized the construction of nanoribbon array thin films. Researchers systematically studied the optical and electrical properties of self-assembled zinc selenide nanoribbons in the evolution of silver selenide nanoribbons and found that self-assembled zinc-selenide nanoribbon array devices can achieve sensitive detection of silver ions in aqueous solutions. On this basis, the researchers further built a silver-selenide nanoribbon array device. Electrical characteristics study found that the constructed nanodevices exhibit complementary resistance switching behavior. At the same time, the study found that the number of self-assembled films of silver selenide nanoribbons also directly affects the resistance conversion potential of the device. In order to reveal the resistance conversion mechanism of the silver selenide nanoribbons, the researchers conducted an in-situ SEM observation of the silver selenide nanoribbons between the electrodes during the electrical testing process, and clearly observed the reduced metal Ag with the scan potential in the nanoribbons. The change and migration and the formation of the lead, resulting in changes in the resistance of the nanoribbon. This research work will provide new ideas for the development of new resistance-switching nanodevices and the working mechanism of resistance conversion devices. The research work has been supported by the national major scientific research project nanometer special project, the national high-tech research and development plan ("863" program), the National Natural Science Foundation and other projects.
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