Cholesteric film of Cu(II)-doped cellulose nanocrystals for colorimetric sensing of ammonia gas

Dai, Shidong; Prempeh, Nana; Liu, Dagang; Fan, Yimin; Gu, Mingyue; Chang, Yu Chung

doi:10.1016/j.carbpol.2017.06.098

Cited by 64 publications

(38 citation statements)

References 31 publications

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“…The role of a sensing device is to provide an immediate response to the appearance of a toxic gas, rather than relying on expensive instrumentation [15]. This layer of BCP, on its own, responds immediately to the presence of ammonia.…”

Section: Methodsmentioning

confidence: 99%

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An Ammonia Sensor Using an Unadorned Bromocresol Layer

Néill

Akdağ

Betts

et al. 2020

International Journal of Environmental Analytical Chemistry

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Bromocresol Purple,(BCP) cast onto an acetate sheet, was used to sense ammonia. This simple layer responded reversibly to a low concentration (15 ppm) of ammonia in the presence of water vapour. The BCP solution was spincoated on an acetate sheet from a solution in dichloromethane. This layer was exposed to nitrogen and NH 3 /H 2 O vapour in quick succession. The colour change occurred from yellow to purple rapidly in the solid state. The λ max for the neutral (acid) form of the BCP was found to be 435 nm and the λ max for the dianion (base form) of the BCP was found to be 610 nm A mechanism previously predicted theoretically was confirmed using FTIR identifying the presence of a peak associated with a carbonyl in the dianion form.

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Section: Methodsmentioning

confidence: 99%

“…Cu(II) doped cholesteric liquid crystals have been shown to experience a red shift of the λ max on exposure to pure NH 3 gas [15]. In addition a fluorescent and colorimetric sensor was based on Cu(II)-2,7-bis(1-imidazole) fluorene DMF gel which responded to ammonia vapour with a limit of detection of 5 ppm [16].…”

mentioning

confidence: 99%

An Ammonia Sensor Using an Unadorned Bromocresol Layer

Néill

Akdağ

Betts

et al. 2020

International Journal of Environmental Analytical Chemistry

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“…By fabricating a CuCl 2 /CNCs‐based film, a green and cheap sensor was obtained and allowed ammonia gas sensing due to an ammonia gas‐induced reversible redshift upon reaching the lower critical gap concentration. [ 197 ] The color change is caused by the electrostatic adsorption of Cu 2+ onto the CNC surface, which would increase the pitch and lead to redshift after absorbing NH 3 . In addition, they investigated that the amount of Cu 2+ did not have a positive correlation with the performance of the film.…”

Section: Functional Chiral Liquid Crystal Film Materials Derived From...mentioning

confidence: 99%

Chiral Photonic Liquid Crystal Films Derived from Cellulose Nanocrystals

Duan

Cheng

Wang

et al. 2021

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As a nanoscale renewable resource derived from lignocellulosic materials, cellulose nanocrystals (CNCs) have the features of high purity, high crystallinity, high aspect ratio, high Young's modulus, and large specific surface area. The most interesting trait is that they can form the entire films with bright structural colors through the evaporation‐induced self‐assembly (EISA) process under certain conditions. Structural color originates from micro‐nano structure of CNCs matrixes via the interaction of nanoparticles with light, rather than the absorption and reflection of light from the pigment. CNCs are the new generation of photonic liquid crystal materials of choice due to their simple and convenient preparation processes, environmentally friendly fabrication approaches, and intrinsic chiral nematic structure. Therefore, understanding the forming mechanism of CNCs in nanoarchitectonics is crucial to multiple fields of physics, chemistry, materials science, and engineering application. Herein, a timely summary of the chiral photonic liquid crystal films derived from CNCs is systematically presented. The relationship of CNC, structural color, chiral nematic structure, film performance, and applications of chiral photonic liquid crystal films is discussed. The review article also summarizes the most recent achievements in the field of CNCs‐based photonic functional materials along with the faced challenges.

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“…Colorimetric chemosensors are becoming more popular due to their highly sensitive and selective response towards gaseous analytes in real-time for on-site detection. [31][32][33] The colorimetric signal change can be qualitatively recognized by naked eyes without using any professional equipment and complicated data analysis, which is very useful for the detection of indoor and outdoor aldehydes in a less complicated way.…”

Section: Colorimetric Sensorsmentioning

confidence: 99%