Rapid NIR light detection and/or writing has drawn much attention, but their practical applications have been limited by obtaining such NIR photodetectors. To address this problem, we have developed a simple and versatile strategy to prepare a non-woven fabric photodetector. The blue non-woven fabric photodetector has been prepared by coating photo-thermochromic ink (including crystal violet lactone (CVL) as the thermo-sensitive dye, polypyrrole (PPy) nanospheres as the photothermal component and hydroxyethyl cellulose (HEC) as the polymer matrix) on white non-woven fabric. When the blue fabric photodetector is irradiated by NIR (808-nm as model, 0.75 W cm⁻²) laser, the discoloration occurs in 35 s, and higher laser intensity confers more rapid discoloration. This discoloration results from the photothermal effect of PPy which confers the elevation of temperature (> 50 °C) and then converts CVL to its leuco form (colorless). When the laser is turned off, the temperature drops to below the transition temperature (< 43 °C), and then CVL reverts to its initial blue color. Moreover, different figures and images can be easily printed on the fabric photodetector by 808 nm laser, and then they can be erased automatically under ambient conditions, with excellent cycling stability. Therefore, this fabric photodetector may act as a new platform for rapid NIR light detection and writing.

中文翻译：

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基于聚吡咯/水晶内酯的柔性可重复使用的无纺布光电探测器近红外光的检测和写入

快速的近红外光检测和/或书写引起了很多关注，但是通过获得这种近红外光检测器，其实际应用受到了限制。为了解决这个问题，我们开发了一种简单而通用的策略来制备无纺布光电探测器。蓝色无纺布光电探测器是通过涂覆光热致变色油墨（包括作为热敏染料的结晶紫内酯（CVL），作为光热成分的聚吡咯（PPy）纳米球和作为聚合物基质的羟乙基纤维素（HEC）制备的）放在白色无纺布上。当用NIR照射蓝色织物光电探测器时（模型为808-nm，0.75 W cm ^-2）激光，变色发生在35 s内，更高的激光强度使变色更快。这种变色是由PPy的光热效应引起的，它赋予了温度升高（> 50°C），然后将CVL转换为无色形式（无色）。关闭激光器后，温度降至转变温度以下（<43°C），然后CVL恢复为初始蓝色。此外，可以通过808 nm激光轻松将不同的图形和图像打印在织物光电探测器上，然后可以在环境条件下自动擦除它们，并具有出色的循环稳定性。因此，这种织物光电探测器可以作为快速NIR光检测和写入的新平台。