4.8 Article

Exploring Reversible Thermochromic Behavior in a Rare Ni(II)-MOF System

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 5, 页码 6430-6441

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c21116

关键词

thermochromism; metal-organic frameworks; efficient regeneration process; high cyclability; ultrastable

资金

  1. National Natural Science Foundation of China [21543001]
  2. Education Committee of Shaanxi Province [17JS131]

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The study presents an ultrastable Ni(II)-MOF that exhibits an unprecedented reversible four-step color change in a wide temperature range, with regeneration achieved within 1 min. This work sets the stage for the development of more MOF-based reversible thermochromic materials with excellent performance.
Thermochromic metal-organic frameworks (MOFs) are promising functional materials for a wide range of applications due to their ability to exhibit color variation under external temperature stimuli, yet the development of them with high cyclability and efficient regeneration processes remains challenging. Here, presented is a rare example of an ultrastable Ni(II)-MOF exhibiting an unprecedented reversible four-step color change between two complementary colors in a wide temperature range, which could be repeated for at least 500 cycles without losing crystallinity and thermochromic performance. Notably, the regeneration can be achieved within 1 min by simply letting the crystals cool naturally in the air, facilitated by the unique nature of the channels' inner surface. The reversible thermochromic behavior is owing to a series of reversible crystal structure changes with temperature, including the stepwise dehydration/rehydration process, and structural changes. This work facilitates the future development of more MOF-based reversible thermochromic materials with excellent performance and improved practical applicability.

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