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Ultra-Low-Density Carbon Nanotube Aerogel Film for Fast and Sensitive Bolometric Sensing
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-02-23 , DOI: 10.1021/acsami.2c20099 Yuanhong Huang 1 , Lujie Wei 1 , Tingting Chen 1 , Tianhang Xu 1 , Yifei Cai 1 , Yayi Guo 1 , Yangsu Xie 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-02-23 , DOI: 10.1021/acsami.2c20099 Yuanhong Huang 1 , Lujie Wei 1 , Tingting Chen 1 , Tianhang Xu 1 , Yifei Cai 1 , Yayi Guo 1 , Yangsu Xie 1
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In various applications, infrared (IR) detectors with quick responses and high sensitivity at room temperature are essential. This work synthesizes carbon nanotube aerogel films (CAFs) with an ultra-low density of 1.33 mg cm–3. Transient electrothermal (TET) technology is used to characterize the thermal and electrical transport of CAFs in the temperature range of 320 to 10 K. CAF has record-low thermal conductivity (2.5 mW m–1 K–1 at 320 K) and thermal diffusivity (2.24 × 10–6 m2 s–1 at 320 K) in vacuum. The TCR of CAF is −0.11%/K at 295 K, which is 57% higher than that of the MWCNT films. In addition, the comprehensive bolometric performance of carbon nanotube aerogels is tested and analyzed, including the photothermal response, resistivity responsivity, and response time to lasers of a broad spectrum from ultraviolet to near-infrared. The relative responsivity of CAF to lasers of different wavelengths is found to be consistent. The response time of CAF with 200 μm suspended length is measured to be as short as 2.95–3.03 ms (framing rate of 330–339 per second). In addition, the resistive response of the CAF sample to a blackbody radiator and the radiation of the human hand also shows good sensitivity and repeatability. These results demonstrate the promising application of CAF as a sensitive and fast-response uncooled bolometer.
中文翻译：
超低密度碳纳米管气凝胶薄膜用于快速灵敏的辐射热传感
在各种应用中，在室温下具有快速响应和高灵敏度的红外 (IR) 探测器必不可少。这项工作合成了具有 1.33 mg cm –3超低密度的碳纳米管气凝胶薄膜 (CAF) 。瞬态电热 (TET) 技术用于表征 CAF 在 320 至 10 K 温度范围内的热传输和电传输。CAF 具有创纪录的低热导率（320 K 时为 2.5 mW m –1 K –1）和热扩散率（2.24 × 10 –6米2秒–1在 320 K) 真空中。CAF 的 TCR 在 295 K 时为 -0.11%/K，比 MWCNT 薄膜高 57%。此外，还对碳纳米管气凝胶的综合辐射热性能进行了测试和分析，包括光热响应、电阻率响应度以及对从紫外到近红外的广谱激光的响应时间。发现 CAF 对不同波长激光的相对响应度是一致的。经测量，悬垂长度为 200 μm 的 CAF 的响应时间短至 2.95–3.03 毫秒（帧速率为每秒 330–339）。此外，CAF样品对黑体辐射体和人手辐射的电阻响应也显示出良好的灵敏度和可重复性。
更新日期：2023-02-23
中文翻译：
超低密度碳纳米管气凝胶薄膜用于快速灵敏的辐射热传感
在各种应用中，在室温下具有快速响应和高灵敏度的红外 (IR) 探测器必不可少。这项工作合成了具有 1.33 mg cm –3超低密度的碳纳米管气凝胶薄膜 (CAF) 。瞬态电热 (TET) 技术用于表征 CAF 在 320 至 10 K 温度范围内的热传输和电传输。CAF 具有创纪录的低热导率（320 K 时为 2.5 mW m –1 K –1）和热扩散率（2.24 × 10 –6米2秒–1在 320 K) 真空中。CAF 的 TCR 在 295 K 时为 -0.11%/K，比 MWCNT 薄膜高 57%。此外，还对碳纳米管气凝胶的综合辐射热性能进行了测试和分析，包括光热响应、电阻率响应度以及对从紫外到近红外的广谱激光的响应时间。发现 CAF 对不同波长激光的相对响应度是一致的。经测量，悬垂长度为 200 μm 的 CAF 的响应时间短至 2.95–3.03 毫秒（帧速率为每秒 330–339）。此外，CAF样品对黑体辐射体和人手辐射的电阻响应也显示出良好的灵敏度和可重复性。
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