Self-Assembled Chromogen-loaded Polymeric Cocoon for Respiratory Virus Detection

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Pt-embodiment ZIF-67-derived nanocage as enhanced immunoassay for infectious virus detection

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New Avenue for Appendage of Graphene Quantum Dots on Halloysite Nanotubes as Anode Materials for High Performance Supercapacitors

Graphene quantum dots (GQDs) are a newly developed graphene family with good electrical conductivity and high theoretical capacitance, while halloysite nanotubes (HNTs) are naturally occurring layered mineral materials containing high active sites for energy storage support. The combination of HNTs and GQDs can offer a new strategy on the fabrication of eco-friendly electrode materials for high performance supercapacitor applications. Herein, an environmentally friendly GQD-HNT nanocomposite is fabricated in the presence of (3-aminopropyl)-triethoxysilane to provide increased charge storage sites as well as to allow for the fast charge transport for supercapacitor application. Morphological and surface analytical results show that 5–10 nm GQDs are homogeneously distributed on the surface of APTES-coated HNTs via amide linkage. This new and novel layered nanocomposite can provide accessible electroactive sites and low resistance to accelerate the electrons and electrolyte ion transport, resulting in excellent specific capacitance and high energy density. The specific capacitances of 363–216 F/g at current densities of 0.5–20 A/g are obtained. In addition, the GQD-HNTs exhibit excellent energy density of 30–50 Wh/kg. Results obtained in this study clearly demonstrate the feasibility of using GQD-HNTs as alternative energy storage materials with increased charge storage sites and fast charge transport for high energy density supercapacitor applications

N‑Doped Graphene Quantum Dots-Decorated V₂O₅ Nanosheet for Fluorescence Turn Off–On Detection of Cysteine

The development of a fast-response sensing technique for detection of cysteine can provide an analytical platform for prescreening of disease. Herein, we have developed a fluorescence turn off–on fluorescence sensing platform by combining nitrogen-doped graphene quantum dots (N-GQDs) with V₂O₅ nanosheets for the sensitive and selective detection of cysteine in human serum samples. V₂O₅ nanosheets with 2–4 layers are successfully synthesized via a simple and scalable liquid exfoliation method and then deposited with 2–8 nm of N-GQDs as the fluorescence turn off–on nanoprobe for effective detection of cysteine in human serum samples. The V₂O₅ nanosheets serve as both fluorescence quencher and cysteine recognizer in the sensing platform. The fluorescence intensity of N-GQDs with quantum yield of 0.34 can be quenched after attachment onto V₂O₅ nanosheets. The addition of cysteine triggers the reduction of V₂O₅ to V⁴⁺ as well as the release of N-GQDs within 4 min, resulting in the recovery of fluorescence intensity for the turn off–on detection of cysteine. The sensing platform exhibits a two-stage linear response to cysteine in the concentration range of 0.1–15 and 15–125 μM at pH 6.5, and the limit of detection is 50 nM. The fluorescence response of N-GQD@V₂O₅ exhibits high selectivity toward cysteine over other 22 electrolytes and biomolecules. Moreover, this promising platform is successfully applied in detection of cysteine in human serum samples with excellent recovery of (95 ± 3.8) – (108 ± 2.4)%. These results clearly demonstrate a newly developed redox reaction-based nanosensing platform using N-GQD@V₂O₅ nanocomposites as the sensing probe for cysteine-associated disease monitoring and diagnosis in biomedical applications, which can open an avenue for the development of high performance and robust sensing probes to detect organic metabolites

Cargo encapsulated hepatitis E virus-like particles for anti-HEV antibody detection

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CdSe-Co3O4@TiO2 nanoflower–based photoelectrochemical platform probing visible light–driven virus detection

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Fluorescent and electrochemical dual-mode detection of Chikungunya virus E1 protein using fluorophore-embedded and redox probe-encapsulated liposomes

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