Recently, researchers Yang Qing, Liu Ying, and Li Zetang of the Wang Zhonglin team at the Georgia Institute of Technology successfully prepared a micro-nanocomposite high-efficiency microbial cell-driven highly sensitive semiconductor nanowire photodetector and developed a self-driven high Sensitive micro-nanometer sensor system. The application of the micro-nano-optical sensor system will play an important role in reducing energy consumption and developing a new type of ultra-sensitive sensor network, and will promote the wide application of micro-nano devices in various fields such as mechanical, electrical, optical, energy, and biology. The related results were published in German "Applied Chemistry".

It is understood that the rapid development of the Internet of Things technology requires massive and low-energy types of sensors that are responsible for collecting environmental information in real time, constantly updating data, and intelligently handling and controlling things through the Internet.

Photosensors based on nanomaterials have the advantages of high sensitivity, high speed, low energy consumption, and meet the needs of the development of Internet of Things technology. However, so far, highly sensitive nanomaterial photosensors are mainly driven by external circuits, which not only significantly increases the size of the micro-nano devices, but also severely limits the flexibility of use of the devices. To this end, building a micro-nano system with multiple functions of sensing, control, communication, and feedback is one of the main goals of the development of nanotechnology.

Under the guidance of Wang Zhonglin, Yang Qing, Liu Ying, and Li Zetang successfully developed a micro-microbial battery-driven nanowire photodetector using micro-nanocomposites, and further developed a self-driven high-sensitivity micro-nano light sensor system. The power density output of the μL-size microbial cell of the system reaches 30 W/m2 (relative to the electrode area), and reaches the best level of internationally reported results. At the same time, the system has a high light detection sensitivity and can detect nW/cm2 of light with a responsivity of 300 A/W. In addition, noise analysis shows that the device's noise equivalent power is 2 to 3 orders of magnitude lower than reported in the world.

Experts in the industry stated that the scope of application of the research covers a wide range of areas such as the environment, health, energy, and communications. For example, it can be widely used in the monitoring of sewage and gas pollutants in the environmental field. (trainee reporter Qiu Rui)

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