Azobenzene/Acid Binary Systems for Colorimetric Humidity Sensing with Reversibility, High Sensitivity, and Tunable Colors

Li, Lishan; Zhou, Nianchen; Zhao, Yue

doi:10.1021/acsami.1c24529

Cited by 13 publications

(5 citation statements)

References 45 publications

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“…[25][26][27][28][29][30][31][32] We selected azopolymers for photopatterning because they have interesting photoresponsive properties for the preparation of complex patterns. [33][34][35][36][37][38] In addition, we recently reported that some azopolymers exhibited photo induced reversible solid-to-liquid transitions. [39,40] Photonic structures were imprinted on the photoliquefied regions of these azopolymers.…”

Section: Doi: 101002/adma202202150mentioning

confidence: 99%

Designing Rewritable Dual‐Mode Patterns using a Stretchable Photoresponsive Polymer via Orthogonal Photopatterning

Liang

et al. 2022

Advanced Materials

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The fabrication of dual‐mode patterns in the same region of a material is a promising approach for high‐density information storage, new anti‐counterfeiting technologies, and highly secure encryption. However, dual‐mode patterns are difficult to achieve because the two patterns in one material may interfere with each other during fabrication and usage. The development of noninterfering dual‐mode patterns requires new materials and patterning techniques. Herein, a novel orthogonal photopatterning technique is reported for the fabrication of noninterfering dual‐mode patterns on an azopolymer P1. P1 is a unique material that exhibits both photoinduced reversible solid‐to‐liquid transitions and good stretchability. In the first step of orthogonal photopatterning, patterned photonic structures are fabricated on a P1 film via masked nanoimprinting controlled by photoinduced reversible solid‐to‐liquid transitions. In the second step, the P1 film is stretched and irradiated with polarized light through a photomask, which generates a chromatic polarization pattern. In particular, the photonic structures and chromatic polarization in the dual‐mode pattern are noninterfering. Another feature of dual‐mode patterns is that they are rewritable via photo‐, thermal, or solution reprocessing, which are useful for recycling and reprogramming. This study opens an avenue for the development of novel materials and techniques for photopatterning.

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Section: Doi: 101002/adma202202150mentioning

confidence: 99%

Designing Rewritable Dual‐Mode Patterns using a Stretchable Photoresponsive Polymer via Orthogonal Photopatterning

Liang

et al. 2022

Advanced Materials

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“…Such colorimetric azobenzene sensors have been used to detect several metal cations, such as Hg 2+ [40], Al 3+ [41], Cu 2+ [42], Pb 2+ [43] as well as organic molecules relevant to applications in biology, such as sugar [44] and cysteine [45]. Li et al recently demonstrated sensors for humidity based on the deprotonation of protonated azobenzenes in azobenzene/acid binary systems [46]. Fast response of 2.3 s to full color change and tunable colors were reported, and monitoring of human breathing was raised as the most promising application.…”

Section: Azobenzenes For Chemical Sensingmentioning

confidence: 99%

“…The majority of chemical sensing with azobenzenes is solution-based where both the indicator azobenzene and the analyte are dissolved into water or mixtures of water and an organic solvent, such as acetonitrile or ethanol [40-43, 45, 47]. In some cases, the indicator has been bound to a solid material by embedding to silica [40] or covalently linking it to a suitable polymer, [57] creating convenient sensors for the detection of ionic species in solution or simply used as a paint to cover glass plates to create a humidity sensor [46]. Solid polymers enable additional specificity for the sensing as demonstrated in highly selective sensing of bisphenol A by molecular imprinted azobenzene polymers [55].…”

Section: Azobenzenes For Chemical Sensingmentioning

confidence: 99%

New tricks and emerging applications from contemporary azobenzene research

Fedele

Ruoko

Kuntze

et al. 2022

Photochem Photobiol Sci

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Azobenzenes have many faces. They are well-known as dyes, but most of all, azobenzenes are versatile photoswitchable molecules with powerful photochemical properties. Azobenzene photochemistry has been extensively studied for decades, but only relatively recently research has taken a steer towards applications, ranging from photonics and robotics to photobiology. In this perspective, after an overview of the recent trends in the molecular design of azobenzenes, we highlight three research areas where the azobenzene photoswitches may bring about promising technological innovations: chemical sensing, organic transistors, and cell signaling. Ingenious molecular designs have enabled versatile control of azobenzene photochemical properties, which has in turn facilitated the development of chemical sensors and photoswitchable organic transistors. Finally, the power of azobenzenes in biology is exemplified by vision restoration and photactivation of neural signaling. Although the selected examples reveal only some of the faces of azobenzenes, we expect the fields presented to develop rapidly in the near future, and that azobenzenes will play a central role in this development.

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“…Switchable and adjustable transparency materials have crucial applications, such as sensors, − bendable medical devices, anticounterfeiting devices, − or smart windows. − With the rapid development of modern materials science, researchers have successfully prepared various kinds of transparent and adjustable materials, the most studied of which are gel materials. At present, most of the investigations on gel materials have been carried out to achieve dynamic switching of transparency in different contexts through thermal, − electrical, , and nature stimuli .…”

Section: Introductionmentioning

confidence: 99%

Novel Green Reversible Humidity-Responsive Hemiaminal Dynamic Covalent Network for Smart Window

Zhang

Jia

et al. 2023

ACS Appl. Mater. Interfaces

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Recently, smart windows have attracted widespread attention on account of their unique features, yet traditional smart windows still rely on external energy support to accomplish dynamic reversible switching, which not only confines usage but also causes waste of energy. For this purpose, we have prepared hemiaminal dynamic covalent network (HDCN) film with outstanding flexibility and strength by a simple and low-cost method, in which the modulus is 206.28 MPa and the elongation at break is 39.02%. Additionally, the transition from a transparent to an opaque state is achieved when the film is stimulated by humidity, and the dynamic transformation of the film to different phases of transparency is obtained when the film is exposed to different relative humidities (60−99%). Most importantly, HDCN film fulfills the modern green requirements and enables complete dissolution in a certain mildly acidic solution, avoiding environmental pollution when the material is discarded due to loss of function. The dynamic tunability of HDCN film demonstrates great advantages and potential in smart windows and anticounterfeiting.

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Azobenzene/Acid Binary Systems for Colorimetric Humidity Sensing with Reversibility, High Sensitivity, and Tunable Colors

Cited by 13 publications

References 45 publications

Designing Rewritable Dual‐Mode Patterns using a Stretchable Photoresponsive Polymer via Orthogonal Photopatterning

Designing Rewritable Dual‐Mode Patterns using a Stretchable Photoresponsive Polymer via Orthogonal Photopatterning

New tricks and emerging applications from contemporary azobenzene research

Novel Green Reversible Humidity-Responsive Hemiaminal Dynamic Covalent Network for Smart Window

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