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[China Instrument Network: Advances in Cantilever Thin-Film Photoacoustic Spectroscopy] Recently, a research team led by Gao Xiaoming and Liu Wei from the Anguang Institute of Research and Development has achieved significant progress in the field of cantilever-type thin-film photoacoustic spectroscopy. Their groundbreaking work titled "A novel photoacoustic spectroscopy gas sensor using a low-cost polyvinylidene fluoride (PVDF) film" has been published online in *Sensors and Actuators B: Chemical* (a top-tier journal with an impact factor of 5.6).
This development marks a major step forward in the field of photoacoustic sensing, which is known for its high sensitivity, minimal frequency dependence, and simple design. Over the years, researchers have explored various innovations, including cantilever-based photoacoustic systems, quartz tuning fork resonance-enhanced techniques, and multi-channel configurations. Among these, cantilever photoacoustic spectroscopy stands out for its exceptional sensitivity, but it traditionally relies on optical interferometers to detect vibrations, making the system complex and costly.
In this new study, Liu Wei, an associate researcher, introduced a novel approach by utilizing a piezoelectric PVDF film for the first time in cantilever photoacoustic spectroscopy. Instead of using optical methods, the team directly detected the vibration caused by photoacoustic signals through the electrical output generated by the piezoelectric properties of the PVDF film. This breakthrough eliminates the need for complicated optical setups, significantly simplifying the overall structure of the device. The method was successfully tested by detecting atmospheric water vapor molecules, confirming its practical potential.
The advantages of this new technique are numerous. First, it reduces both the complexity and cost of traditional cantilever-based systems. Second, the flexibility of the PVDF film enhances the adaptability of the device in different environmental conditions. Third, the material’s strong corrosion resistance makes it ideal for analyzing highly corrosive gases such as ozone (O₃), nitrogen dioxide (NO₂), and ammonia (NH₃).
This research was supported by the National Natural Science Foundation of China, the Youth Fund, and the Chinese Academy of Sciences Youth Innovation Promotion Association.
(Original title: Anguang Makes a New Breakthrough in the Research of Cantilever Film Photoacoustic Spectroscopy Technology)