Photochromic sensors: a versatile approach for recognition and discrimination

Qin, Meng; Huang, Yu; Li, Fengyu; Song, Yanlin

doi:10.1039/c5tc01939g

Cited by 129 publications

(61 citation statements)

References 102 publications

(197 reference statements)

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“…This leads to changes in the electrical conductance of the molecule between two electrodes. The conductance measurement of azobenzene between metallic electrodes shows that the single molecule conductance of cis confirmation is higher than trans confirmation by only a factor of two in agreement with predictions from theory (see Section A of the supporting information SI and Figures S1 and S2) [21,22]. This ratio is higher in self-assembled monolayers formed by azobenzene molecules because of changes in contacting modality and molecular film thickness [23,24].…”

Section: Introductionsupporting

confidence: 80%

Switching Quantum Interference in Phenoxyquinone Single Molecule Junction with Light

2020

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Quantum interference (QI) can lead to large variations in single molecule conductance. However, controlling QI using external stimuli is challenging. The molecular structure of phenoxyquinone can be tuned reversibly using light stimulus. In this paper, we show that this can be utilized to control QI in phenoxyquinone derivatives. Our calculations indicate that, as a result of such variation in molecular structure of phenoxyquinone, a crossover from destructive to constructive QI is induced. This leads to a significant variation in the single molecule conductance by a couple of orders of magnitude. This control of QI using light is a new paradigm in photosensitive single molecule switches and opens new avenues for future QI-based photoswitches.

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Section: Introductionsupporting

confidence: 80%

Switching Quantum Interference in Phenoxyquinone Single Molecule Junction with Light

2020

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“…7,8 The utility of photoswitchable materials can be further expanded if the materials are multiresponsive, that is, their optical response can be tuned via changes in environmental conditions (e.g., humidity, pH, presence of analytes). This offers a conceptual basis for photochromic sensors, 9,10 which have been developed from diarylethenes and spiropyrans, for example, for sensing anions, 11 amines, 12 and thiols. 13 For azobenzenes, to the best of our knowledge, such an isomerization kinetics based concept has not been demonstrated.…”

mentioning

confidence: 99%

Thermal Isomerization of Hydroxyazobenzenes as a Platform for Vapor Sensing

et al. 2018

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Photoisomerization of azobenzene derivatives is a versatile tool for devising light-responsive materials for a broad range of applications in photonics, robotics, microfabrication, and biomaterials science. Some applications rely on fast isomerization kinetics, while for others, bistable azobenzenes are preferred. However, solid-state materials where the isomerization kinetics depends on the environmental conditions have been largely overlooked. Herein, an approach to utilize the environmental sensitivity of isomerization kinetics is developed. It is demonstrated that thin polymer films containing hydroxyazobenzenes offer a conceptually novel platform for sensing hydrogen-bonding vapors in the environment. The concept is based on accelerating the thermal cis–trans isomerization rate through hydrogen-bond-catalyzed changes in the thermal isomerization pathway, which allows for devising a relative humidity sensor with high sensitivity and quick response to relative humidity changes. The approach is also applicable for detecting other hydrogen-bonding vapors such as methanol and ethanol. Employing isomerization kinetics of azobenzenes for vapor sensing opens new intriguing possibilities for using azobenzene molecules in the future.

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“…[90][91][92][93][94][95] PCs with varied responsivities and PBGs can be used as different channels,sothe array patterned microchip consisting of different PCs is an ideal platform for cross-reactive analysis systems. [96][97][98][99] As eries of PC microspheres has been developed by Gu and co-workers,and individual determinations for protein, [100] DNA, [82] ions, [101,102] and cells [103] have been realized through the modification of specific responsive materials.H owever, the determination of vapors is ab ig challenge because it is hard to find one responsive material that can specifically identify them. To achieve the determination vapors in acrossreactive system, Gu et al designed an array microchip called an "optical nose", which consisted of 16 kinds of mesoporous PC microbeads (Figure 6a).…”

Section: Methodsmentioning

confidence: 99%

Patterned Colloidal Photonic Crystals

2017

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Colloidal photonic crystals (PCs) have been well developed because they are easy to prepare, cost-effective, and versatile with regards to modification and functionalization. Patterned colloidal PCs contribute a novel approach to constructing high-performance PC devices with unique structures and specific functions. In this review, an overview of the strategies for fabricating patterned colloidal PCs, including patterned substrate-induced assembly, inkjet printing, and selective immobilization and modification, is presented. The advantages of patterned PC devices are also discussed in detail, for example, improved detection sensitivity and response speed of the sensors, control over the flow direction and wicking rate of microfluidic channels, recognition of cross-reactive molecules through an array-patterned microchip, fabrication of display devices with tunable patterns, well-arranged RGB units, and wide viewing-angles, and the ability to construct anti-counterfeiting devices with different security strategies. Finally, the perspective of future developments and challenges is presented.

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Photochromic sensors: a versatile approach for recognition and discrimination

Cited by 129 publications

References 102 publications

Switching Quantum Interference in Phenoxyquinone Single Molecule Junction with Light

Switching Quantum Interference in Phenoxyquinone Single Molecule Junction with Light

Thermal Isomerization of Hydroxyazobenzenes as a Platform for Vapor Sensing

Patterned Colloidal Photonic Crystals

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