Reversible photo/thermal stimuli-responsive electrical bistability performance in supramolecular co-crystals accompanied by crystalline-to-amorphous transformations. Issue 9 (4th February 2020)

• Record Type: Journal Article
• Authors: Liu, Qian; Zhao, Liming; Wu, Wei; He, Yan; Song, Kaiyue; Qi, Jiayuan; Li, Haohong; Chen, Zhirong
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 9(2020)
• Page Start: 3258
• Page End: 3267
• Publication Date: 2020-02-04
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc05843e
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A co-crystal-based device exhibits reversibly stimuli-responsive switchable conductivity states, and its photo/thermal responsive electrically bistable switching mechanism was proposed. Abstract : Stimuli-responsive electrically bistable devices are significant for the development of new generation memory materials. In this study, a co-crystal, (MA-H)2 (PZDC)·4H2 O (MA = 1, 3, 5-triazine-2, 4, 6-triamine, melamine; H2 -PZDC = pyrazine-2, 3-dicarboxylate), was firstly fabricated as an active layer to prepare an ITO/(MA-H)2 (PZDC)·4H2 O/Ag device, which exhibits switchable conductivity states with an ON/OFF current ratio of 10 5 . Interestingly, the electrical bistability performance can be quenched by heating and irradiating stimuli accompanied by reversible crystalline-to-amorphous transformations, which can be recovered by soaking the samples in water. Based on the crystal structures after heating/irradiation and theoretical calculations, a photo/thermal responsive electrical bistability switching mechanism was proposed: the decreased band gap caused by the disappearance of lattice water around PZDC 2− will inhibit the formation of a countering space-charge field and consequently, the electrical bistability behaviors will vanish. This study paves a new way for the design of stimuli-responsive electrical bistability materials.