Photonic hydrogels for the ultratrace sensing of divalent beryllium in seawater

Qin, Junjie; Dong, Bohua; Cao, Lixin; Wang, Wei

doi:10.1039/c8tc00242h

Cited by 40 publications

(35 citation statements)

References 61 publications

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“…Hydrogel-based PhC sensors are generally polymerized nonclose-packed colloidal crystals or inverse opal hydrogels, 47,97 where the polymer networks are either covalently functionalized with the probe molecules, or infiltrated with functional nanoparticles (e.g., CDs). Once target analytes diffuse into the functionalized PhC hydrogels, they can react with probes, leading to a change in hydrogel volume and thereby an optical response.…”

Section: Lattice-spacing-induced Sensingmentioning

confidence: 99%

Bottom-Up Assembled Photonic Crystals for Structure-Enabled Label-Free Sensing

et al. 2021

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Photonic crystals (PhCs) display photonic stop bands (PSBs) and at the edges of these PSBs transport light with reduced velocity, enabling the PhCs to confine and manipulate incident light with enhanced light–matter interaction. Intense research has been devoted to leveraging the optical properties of PhCs for the development of optical sensors for bioassays, diagnosis, and environmental monitoring. These applications have furthermore benefited from the inherently large surface area of PhCs, giving rise to high analyte adsorption and the wide range of options for structural variations of the PhCs leading to enhanced light–matter interaction. Here, we focus on bottom-up assembled PhCs and review the significant advances that have been made in their use as label-free sensors. We describe their potential for point-of-care devices and in the review include their structural design, constituent materials, fabrication strategy, and sensing working principles. We thereby classify them according to five sensing principles: sensing of refractive index variations, sensing by lattice spacing variations, enhanced fluorescence spectroscopy, surface-enhanced Raman spectroscopy, and configuration transitions.

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Section: Lattice-spacing-induced Sensingmentioning

confidence: 99%

Bottom-Up Assembled Photonic Crystals for Structure-Enabled Label-Free Sensing

et al. 2021

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“…Hypo blood samples (hypoCa-1 and hypoCa-2, concentrations of Ca 2+ are reduced), normal serum, and hypercalcemic blood sample (hyperCa, concentration of Ca 2+ is increased) give rise to different colorimetric signals. Such recognition of metal ions in complex microenvironment is of importance for practical applications and has been achieved with different structural color sensors [67,69]. Ultrahigh sensitivity with microscale sensors is desirable but still challenging for detecting the trace amount of metal ions in real-time health and environment monitoring and disease prescreening.…”

Section: Ph and Ionsmentioning

confidence: 99%

Bioinspired structural color sensors based on responsive soft materials

Qin

Sun

Hua

et al. 2019

Current Opinion in Solid State and Materials Science

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Structural colors in nature have inspired the design of diverse photonic structures, which can interact with light via interference, diffraction or scattering. Among them, responsive soft material-involved photonic structures uniquely feature large volumetric changes upon external stimuli. The volumetric changes result in peak/valley shift of reflection spectra and perceptible color changes, providing responsive soft material-based structural color systems capability of serving as sensors for detecting chemical and biological analytes. Synthetic polymers and some natural materials are the most studied and utilized responsive soft materials for constructing structural color sensors, by tuning the thickness and morphology of formed films, or incorporating them into template structures, or their self-assembling. In this review article, structural colors in nature are firstly introduced, followed by discussing recent developments of promising responsive soft material-based structural color sensors, including the design of structural color sensors based on synthetic polymers and natural materials, as well as their applications for chemical sensing, biosensing, and multi-analyte sensing with sensor arrays. For specific sensing of chemicals and biomolecules, the sensing performance is evaluated in terms of detection range, sensitivity, response time, and selectivity. For multi-analyte sensing, cross-reactive structural sensor arrays based on simply a single soft material will be shown capable of discriminating various series of similar compounds. The future development of structural color sensors is also proposed and discussed.

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“…Since the first demonstration by Asher and co-workers in which PCs were combined with intelligent hydrogels that regulate photonic band gaps by expanding or shrinking, 121 a variety of biosensors based on PC hydrogels (PCHs) have been reported, with the potential to be developed into POC devices for the detection of many types of biomarkers, such as glucoses, lectin protein, kinases, circulating tumor cells, hazardous ions, mycotoxins, Candida albicans and nucleic acids. 113,122–131 Such innovative studies have clearly demonstrated the effectiveness of structural color-based strategies in the development of novel POC devices. Current PCH biosensors, however, are all designed to immobilize only the probe molecules into hydrogels.…”

Section: Optical-based Poc Detectionmentioning

confidence: 99%