60. [ACS Applied Materials & Interfaces] A low-cost, rapidly-responsive, controllable and reversible photochromic hydrogel for display and storage
writer：Yongqi Yang, Lin Guan, Guanghui Gao*
keywords：hydrogels, photochromism, flexible devices, patterning, memory devices
source：期刊
specific source：ACS Applied Materials & Interfaces
Issue time：2018年
Traditional optoelectronic devices without stretchable
performance could be limited for substrates with
irregular shape. Therefore, it is urgent to explore a new generation of
flexible, stretchable and low-cost intelligent vehicles as visual display and
storage devices, such as hydrogels. In the investigation, a novel photochromic
hydrogel was developed by introducing negatively charged ammonium molybdate as
a photochromic unit into polyacrylamide via ionic and covalent crosslinking.
The hydrogel exhibited excellent properties of low cost, easy preparation,
stretchable deformation, fatigue-resistance, high transparence, and second
order response to external signals. Moreover, the photochromic and fading
process of hydrogels could be precisely controlled and repeated under the
irradiation of UV light and exposure of oxygen at different time and
temperature. The photochromic hydrogel could be considered applied for
artificial intelligence system, wearable health care device, and flexible
memory device. Therefore, the strategy for designing a
soft photochromic material would open a new direction to manufacture flexible
and stretchable devices.