The detection of harmful chemical substances is of utmost importance in environmental protection, food safety, medical and health care, industrial production, and defense and military affairs. The sensitivity to light, temperature, and pressure is known in artificial intelligence, human-machine interface, intelligent robots, and artificial Frontier research fields such as electronic skin and wearable devices are also extremely important. Field-effect transistor-based sensors combine the functions of sensing and signal amplification with the advantages of simplicity, portability, high sensitivity, and high selectivity. Some organic semiconductor materials have the potential to be biocompatible and degradable. Therefore, organic transistor sensors are used in the above research. With the use of a large area of ​​application.

Professor Huang Jia of School of Materials Science and Engineering of our university, under the support of national “Young Talents Program”, key research and development projects of the foundation of Shanghai Science and Technology Commission, and National Natural Science Fund, in organic transistor sensors and green, bio-safety flexible electronics The device has made a series of important progress. Some of the research results were published in the Journal of the American Chemical Society, Advanced Materials, Advanced Functional Materials, ACS nano, and Advanced Science. (Advance Science) and other high-level internationally renowned journals.

Dr. Xiaotao Wu, Assistant Professor of the Research Group, has published more than 10 SCI papers under the support of the National Natural Science Foundation of China and the “Sailing Plan” of the Shanghai Municipal Science and Technology Commission. In addition, some of the results were reported by the first/common correspondence author in “Advanced Functions. Advanced Functional Materials (2 articles) Advanced Science (2 articles) and Journal of Materials Chemistry A and other high-level journals.

In the process of research and development of organic transistor chemical sensors, sensing detection of gas and liquid has been realized one after another, but rapid and direct detection of solid powder samples has not been realized. The detection of harmful chemical substances in solid powders, such as rapid and direct detection of melamine in milk powder, has great scientific significance and application value. Huang Jia group designed and manufactured a new type of sensor based on the shoulder-by-side organic diode structure (Figure 1), enabling the sensitive detection of trace solid chemicals in powder samples, which can effectively detect the solid powder contained in the contact sample Very low concentrations of melamine below the food safety standards in China. The research results were recently published in the top international journal of the journal Chemical Journal of the American Chemical Society (Journal of the American Chemical Society (2017) 139, 12366. Impact factor 13.9).

Figure 1. Compositional material and device schematic for a novel side-by-side diode-based sensor

The research group also designed and fabricated a micro-nano hole organic field effect transistor gas sensor, which uses the mechanism of rapid interaction between gas molecules and the conductive channel of the field effect transistor to significantly increase the sensitivity of the sensor. The response sensitivity to ammonia is over 340%/ppm, which shows a clear response to ammonia with a concentration lower than one billionth. The detection limit is the highest record for similar devices at the time of publication. The results were published in the well-known journal of the field of materials. Advanced Functional Materials. (2017) 27, 1700018. Impact Factor 12.1. In addition, the research group has also cooperated with Li Zhuo, a professor of the School of Environmental Studies, to achieve effective monitoring of extremely low concentrations of disinfection by-products in drinking water. The research results were recently published in the Journal of Materials Chemistry A. (2017). 5, 4842. Impact Factor 8.9].

In the research field of photosensitive sensors, Huang Jia's research group used the complementary advantages of inorganic perovskite quantum dots and organic semiconductor composites to successfully prepare organic phototransistors (Fig. 2), which can simultaneously exhibit photoresponses of over 10,000 A/W. More than 1014Jone's light-sensing limit and excellent stability, it achieves multi-parameter high-performance synergy that was difficult to obtain in previous studies. The research results have just been accepted by the top journal of the field of materials (Advanced Materials. (2017) Accepted, DOI: 10.1002/adma.201704062. Impact Factor 19.8] Received.

Figure 2. Phototransistors based on inorganic perovskite quantum dots and organic semiconductor composites

The research group prepared a photosensitive sensor with adjustable response wavelength by a low-cost solution method by intercalating and intercalating organic molecules on the semiconductor molecular structure. The related results were published in ACS Applied Materials and Interfaces. (2016) 8, 25660. Impact Factor 7.5]. He was invited to write an overview of the field of photosensitive sensors. The paper was published in the well-known periodical "Advanced Science. (2017) Accepted, DOI: 10.1002/advs.201700256. Impact Factor 9.0].

Dielectric layer/semiconductor layer interface charge effects are widely present in organic field effect transistors and generally have a detrimental effect on device performance. Professor Huang Jia's research group used this interface effect, which is often considered to be a negative effect, to increase the sensitivity of the device. An artificial electronic skin with excellent temperature-sensitive sensing performance was prepared. The research results were reported in Advanced Functional Materials. [Advanced Functional Materials. (2015) 25, 2138. Impact Factor 12.1]. Later, the research group prepared a photosensitive sensor based on the interface effect, and the results were published in "Advanced Science" (Advance Science. (2016) 1500435. Impact factor 9.0). Professor Huang Jia previously worked with the University of Maryland, using biomass materials combined with organic semiconductors to produce degradable flexible electronic devices. The results were published in ACS Nano [ACS Nano. (2013) 7, 2106. Impact factor 13.9]. Recently, Huang Jia group further used bio-safety, green biodegradable composite solution of polylactic acid and soluble organic semiconductors to prepare devices by inkjet printing. The larger interface area makes this printed flexible device have stronger light-sensitive. Performance, related results were published in Advanced Functional Materials. (2017) 27, 1604163. Impact Factor 12.1. Polylactic acid in the device to give the overall flexibility and bio-security at the same time, amplify the device layer interface charge effect, making the device's sensing performance significantly enhanced, can be applied to artificial skin temperature sensing, artificial intelligence, visual perception, etc. (Figure 3 ). The research team also conducted a deep and systematic study on the mechanism of this interface charge effect, and proposed the direction and strategy for designing this type of sensor. The corresponding results have just been advanced science and technology [Advance Science. (2017) Accepted, DOI: 10.1002 /advs.201700442. Impact factor 9.0] received. Dr. Xiaoqi Wu, Assistant Professor of the Research Group, is the first author or co-corresponding author of this part of the research work on temperature-sensitive light-sensitive sensors.

Figure 3. Flexible temperature-sensitive photosensitive organic transistor sensor based on dielectric layer/semiconductor layer interface effect

This series of work provides new strategies and new ideas for the development and optimization of organic transistor sensors, and broadens the application range of these devices.

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