Tetraphenylethene Carbothioamide‐Based Organic Stimuli‐Responsive Mechanochromic Memristive Devices with Non‐Volatile Memory and Synaptic Learning Functionalities

Abstract

A tetraphenylethene‐based organic material (TC) was synthesized to demonstrate mechanochromic memristive properties. The synthesized material shows aggregation‐induced emission and mechanochromic properties. The solvent optimization study reveals that the ethyl acetate‐based TC switching layer shows good resistive switching (RS) properties. To get the mechanochromic memristive properties, different external stresses (ground, heat, and fume) were applied to the TC materials, and these materials were used for the fabrication of switching layers. The results asserted that ethyl acetate and grinding‐based TC devices show good digital‐type RS effects and non‐volatile memory properties. On the other hand, heating and fuming‐based TC devices show analog and quasi‐digital type RS effects, respectively, and mimic various biological synaptic properties such as potentiation‐depression, excitatory postsynaptic current, and paired‐pulse facilitation index. The present investigation is important to fabricate stimuli‐responsive memory and artificial synaptic devices for futuristic non‐volatile memory and neuromorphic computing applications.

Histotoxicity of AIEgen Based on Triphenylamine for the Simultaneous and Discriminatory Sensing of Hg2+ and Ag+ Directly in Aqueous Media for Environmental Applications

“…After the completion of the reaction and the workup process, the solvent was removed under reduced pressure to form a residue, which was chromatographed on a silica gel column with n -hexane/dichloromethane (V/V 3:1) as an eluent to yield a yellow powder as a TPA-CHO product. (346 mg, 96.0% yield). − 1 H NMR (400 MHz, CDCl 3 ) δ/ppm: 10.02 (s, 1H −CHO), 7.91–7.93, (dd, J = 6.4, 6.8 Hz, 2H −Ar–H), 7.71–7.73, (d, J = 8 Hz, 2H, −Ar–H), 7.506–7.528 (dd, J = 8.8 Hz, 2H, −Ar–H), 7.255–7.308 (q, J = 7.2, 6.4 Hz, 4H −Ar–H), 7.130–7.158 (m, J = 8 Hz, 6H, −Ar–H), 7.048–7.090 (t, J = 7.2, 7.6 Hz, 2H −Ar–H). 13 C NMR: (101 MHz, CDCl 3 ) d/ppm: 192.08, 148.66, 147.57, 146.86, 134.92, 133.02, 130.57, 129.64, 128.26, 127.13, 123.71, 123.35.…”

“…Z. Tang and his team invented a new photophysical phenomenon known as aggregation-induced emission (AIE) in 2001, in which the mixture’s water content affects how quickly weakened or nonemissive luminogens aggregate and become emissive. This conveys that aggregation-induced emission means that weak or nonemissive luminogens aggregate and become emissive. − AIE, on the other hand, exhibited normal solid-state luminescence behavior, and the fundamental cause of the transition from ACQ to AIE was a change in molecular packing from intense π–π stacking to suppressed one. As a result, scientists began to focus on molecule packing rather than the chemical structure.…”

Multifunctional Fluorescent Tetraphenylethene-Based Reversible Mechanochromism for Highly Selective Detection of MnO4– in Aqueous Media and Green Organic Light Emitting Diode Applications

“…In contrast, AIE exhibited a normal solid-state luminescence behavior, and the change in molecular packing from intense π–π stacking to a suppressed one was the primary cause of the transition from ACQ to AIE. As a result, researchers started to concentrate more on molecule packing than molecular structure. − The tetraphenylethene-based luminogens show amazing photophysical phenomena such as aggregation-induced emission, solvatochromism, reversible mechanochromic, etc., which have very useful applications in diverse fields …”

“…1−3 The tetraphenylethene-based luminogens show amazing photophysical phenomena such as aggregation-induced emission, solvatochromism, reversible mechanochromic, etc., which have very useful applications in diverse fields. 4 Because of their use in optical information storage camouflage, mechanical sensors, memory chips, and security papers, luminogens with reversible stimulus-responsive switching in the solid state have drawn a great deal of attention. 5−8 Industry and academia have recently become enthusiastic about the successful applications of various aggregationinduced emission (AIE)-based reversible mechanochromic (MC) materials in cutting-edge nanotechnologies.…”

Ionic Liquid Crystal Thin Film as Switching Layer in Nonvolatile Resistive Memory

“…Accordingly, the physical properties of a resistive switching layer usually determine the entire device’s performance, and optimization of the resistive switching layer is a key challenge in improving the performance. Various materials have been tested as the resistive switching layer, including metal oxides, organic compounds, − and hybrid materials, − with broad prospects for future applications and deeper understanding of each internal mechanism of devices. In addition to the proper selection of a material, the fabrication of its high-quality films is another important aspect in the development of this kind of capacitor-like device.…”