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Bridged Nanowire Produce High-Sensitivity Room-temperature Detectors
作者:管理员    发布于:2013-04-24 10:35:38    文字:【】【】【

New data from Northeast Normal University shows the suspended nanowire provides a new way to improve the sensitivity.

 

It is challenging to detect SO2 gas with semiconductor sensors. Most reported semiconductor SO2 sensors require elevated operating temperature, face difficulty in low concentration detection, and demonstrate low sensitivity or long response time.

 

Now, new research by Yichun Liu and Qingxin Tang at Northeast Normal University in China demonstrates a breakthrough advance to achieve high-sensitivity room-temperature detection of SO2 (Advanced Material, 2013, 25, 2269-2273,  http://onlinelibrary.wiley.com/doi/10.1002/adma.201370102/abstract). Contrasting with placing the semiconductor on a solid insulated layer as the traditional method, they bridge a single-crystalline organic semiconductor nanowire so that the detected gas can directly contact with the charge transport layer. Such a new configuration provides the high performance parameters even comparable to the commercialized solid electrolyte sensors. The detection is realized with an organic transistor configuration which is also easily integrated into the organic amplified circuits to achieve the multifunctional combined organic circuits, and being able to produce them on the nanoscale means their potential applications in low-cost, flexible organic nanoelectronics.

Layout description for image 1: an air-gap device has been shown schematically as cover page in Adv. Mater. The transparent nanowire shows the adsorption of SO2 in the bottom of the nanowire, which is responsible for the high-sensitivity room-temperature SO2 detection.

 

Layout description for image 2: the cuboid presents a nanowire which is surrounded in SO2 ambient. The highlighted SO2 gas molecules are those adsorbed onto the four side surfaces of the nanowire, in particular, onto the bottom surface, which is responsible for the high-sensitivity room-temperature SO2 detection. Imaged by Fan Wang and Zhe Wu.

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