Gu Pan, Wang Jiping, Müller-Buschbaum Peter, Qi Dongming, Zhong Qi
Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, 310018 Hangzhou, China.
Shanghai University of Engineering Science, 333 Long Teng Road, 201620 Shanghai, China.
ACS Appl Mater Interfaces. 2020 Jul 29;12(30):34180-34189. doi: 10.1021/acsami.0c08049. Epub 2020 Jul 20.
To overcome the drawbacks of existing infrared detectors, infrared thin film detectors based on microgels and gold nanorods (Au NRs) are investigated. The microgels with a linear shrinkage of the hydrodynamic diameter between 10 and 55 °C are copolymerized by monomers di(ethylene glycol) methyl ether methacrylate, oligo(ethylene glycol) methyl ether methacrylate, and acrylic acid with a molar ratio of 1:1:1. Homogenous thin films are obtained by spin coating from an aqueous solution on silicon substrates. Upon heating in a water vapor atmosphere, the film thickness of the hybrid films linearly decreases. Heat generation from a plasmon resonance enhanced absorption of the infrared radiation by the Au NRs triggers a linear shrinkage in the hybrid microgel-Au NR films as well. A linear correlation between the film thickness and the applied infrared power density is observed. The sensitivity is enhanced by a slight increase in the amount of Au NRs in the films. Infrared detectors are constructed from the hybrid microgel-Au NR films by adding two electrodes via deposition of two silver layers at the film ends. By monitoring the ohmic resistance, the intensity of the incident infrared light can be obtained. The detectors not only possess a good reversibility and fast response rate but also show a high stability after the resistance measurements. Compared with the traditional infrared detectors, the infrared thin film detectors based on microgels are sensitivity adjustable. Thus, they can be promising candidates for replacing expensive inorganic infrared detectors in areas of daily life applications.
为克服现有红外探测器的缺点，对基于微凝胶和金纳米棒（Au NRs）的红外薄膜探测器进行了研究。通过甲基丙烯酸二（乙二醇）甲醚、甲基丙烯酸寡聚（乙二醇）甲醚和丙烯酸以1:1:1的摩尔比共聚得到在10至55°C之间流体动力学直径呈线性收缩的微凝胶。通过从水溶液旋涂到硅基板上获得均匀薄膜。在水蒸气气氛中加热时，混合薄膜的膜厚呈线性减小。Au NRs对红外辐射的等离子体共振增强吸收产生的热量也引发了混合微凝胶 - Au NR薄膜的线性收缩。观察到膜厚与施加的红外功率密度之间存在线性相关性。通过略微增加薄膜中Au NRs的量可提高灵敏度。通过在薄膜两端沉积两层银来添加两个电极，由混合微凝胶 - Au NR薄膜构建红外探测器。通过监测欧姆电阻，可以获得入射红外光的强度。这些探测器不仅具有良好的可逆性和快速响应速率，而且在电阻测量后还表现出高稳定性。与传统红外探测器相比，基于微凝胶的红外薄膜探测器的灵敏度是可调节的。因此，在日常生活应用领域，它们有望成为替代昂贵无机红外探测器的候选者。
