Surface-enhanced Raman scattering (SERS) has extraordinary potential in detecting hydrogen sulfide (HS) gas molecules due to its high sensitivity and specificity. However, constructing SERS substrates with strong Raman signal enhancement effects has been a major challenge. In this study, a gold/silver nanostars (Au/Ag NSs) islands chip was developed, leveraging the phenomenon that the SERS enhancement can be significantly improved by patterning plasmonic metals with micro/nanostructures.
View Article and Find Full Text PDFIn real-world food safety incidents, hazards are often diverse and coexist simultaneously. Mature single-target detection technologies, while effective, are insufficient for comprehensively evaluating the overall quality and safety of food. As a result, multi-target detection, which enables a more comprehensive assessment of multiple hazards in food, has emerged as a prominent research focus.
View Article and Find Full Text PDFTo distinguish different biothiol species and resolve cysteine interference in fluorescence detection, a fluorescence ratio strategy with shielding effect that specifically responds to GSH without Cys interference was constructed by employing the composite of blue-emitting (B-CDs) and red-emitting carbon dots (R-CDs). The constructed BR-CDs composite showed a decrease in red-emission intensity and simultaneous recovery of blue-emission intensity in the presence of GSH, while the ratio of dual-emission fluorescence intensity, FL/FL, showed a superior linear response to GSH in the range of 30-500 μmol/L with a limit of detection (LOD) of 5.27 μmol/L.
View Article and Find Full Text PDFS-scheme heterojunction is an effective tactic to improve photocatalytic property. But few studies on constructing heterojunction with BiOBr and covalent organic frameworks (COFs) are available. Herein, a novel series of COF-TpTt@BiOBr S-scheme heterojunctions with oxygen vacancies (OVs) were constructed via solvothermal method.
View Article and Find Full Text PDFTetracycline antibiotics (TCs) are extensively used as broad-spectrum antimicrobials. However, their excessive use and misuse have led to serious accumulation in foods and environments, posing a significant threat to human health. To solve such public issue, we have designed a novel dual-mode detection method, integrating colorimetric sensing with surface-enhanced Raman scattering (SERS) technology, for sensitive and rapid evaluation on TCs.
View Article and Find Full Text PDFEnergy and the environment are significant impacting factors for the future development of humankind. In order to improve the corrosion resistance of CdS and decrease the recombination of photogenerated carriers, a novel Cu-CPs@CdS heterojunction with high efficiency mesopores was constructed by a simple hydrothermal method. The effective interfacial contact formation between nano-CdS and Cu-CPs promotes the transfer of photogenerated carriers while exhibiting a high spatial separation rate of charges.
View Article and Find Full Text PDFThe residue of antibiotics and various pollutants has led to an urgent issue in environmental pollution control. In this study, we constructed an S-scheme P-TiO@Zn-MOF heterojunction by self-assembling phosphonate-based MOFs on mesoporous phosphate-TiO beads. Compared to monomers, the P-TiO@Zn-MOF heterojunction exhibits significantly higher photocatalytic activity for the photo-oxidative degradation of ciprofloxacin (97.
View Article and Find Full Text PDFAs an emerging nanoprobe, surface enhanced Raman scattering (SERS) tags hold significant promise in sensing and bioimaging applications due to their attractive merits of anti-photobleaching ability, high sensitivity and specificity, multiplex, and low background capabilities. Recently, several reviews have proposed the application of SERS tags in different fields, however, the specific sensing strategies of SERS tags-based sensors for cellular molecules have not yet been systematically summarized. To provide beneficial and comprehensive insights into the advanced SERS tags technique at the cellular level, this review systematically elaborated on the latest advances in SERS tags-based sensors for cellular molecules detection and imaging.
View Article and Find Full Text PDFIn this study, a novel luminescent carbon dot-rooted polysaccharide hydrogel (CDs@CCP hydrogel) was prepared by crosslinking cellulose, chitosan (CS), and polyvinyl alcohol (PVA) for simultaneous fluorescent sensing and adsorption of Cu. The crosslinking of these low-cost, polysaccharide polymers greatly enhance the mechanical strength of the composite hydrogel while making the polysaccharide-based adsorbent easy to reuse. This composite hydrogel exhibited an excellent adsorption capacity (124.
View Article and Find Full Text PDFAntibiotic residues are becoming more and more concern due to the increasingly serious resistance from bacteria to organism. On-site and accurate evaluation on antibiotics is necessary and urgent to effectively solve such public issue. To provide point-of-care-test (POCT) ideas for antibiotic accurate evaluation, a fluorescence (FL)-surface-enhanced Raman scattering (SERS) dual-mode detection of tetracycline antibiotic (TCs) was realized for the first time.
View Article and Find Full Text PDFThe activation capacity of molecular oxygen is an important indicator to evaluate the photocatalytic efficiency of photocatalysts. In this paper, WS nanosheet was deposited on hyper-crosslinked CTF-1-G (obtained by molecular expansion from covalent triazine framework CTF-1) to form a C-GW heterojunction, which promoted the photodegradation of pollutants and the activation of molecular oxygen. This novel C-GW heterojunction exhibited excellent degradation property for organic pollutants (tetracycline (TC), rhodamine B (RhB)) and activating molecular oxygen under visible light irradiation.
View Article and Find Full Text PDFThe aggravating extreme climate changes and environmental pollution problems have stimulated the exploration of green alternatives to conventional fossil fuels and green environmental treatments. Photocatalysis is recognized as an outstanding green tool for solving the energy crisis and environmental rehabilitation issues. Restricted by the high cost of precious metals, researchers expect to obtain low-cost, efficient and stable photocatalysts.
View Article and Find Full Text PDFMolecularly imprinted polymers (MIPs) were combined with surface-enhanced Raman scattering (SERS) and AgNPs were prepared by in situ reduction within the MIP for selective and sensitive detection of sulfamethazine (SMZ). The MIP@AgNPs composites were characterized in detail by several analytical techniques, showing the generation of polymers and the formation of AgNPs hot spots. The specific affinity and rapid adsorption equilibrium rates of MIP@AgNPs composites were verified by static and kinetic adsorption studies.
View Article and Find Full Text PDFIn this study, hollow CeO nanospheres were grown on UIO-66-NH nanosheets to form a novel CeO/UiO-66-NH (abbreviation, CU) Z-scheme heterojunction photocatalyst by calcination and hydrothermal method for hydrogen production and photocatalytic degradation of organic pollutants. Under visible light, the H generation rate of the CU composite was 5662.1 μmol g h, which was 22 and 7 fold than that of pure CeO and pure UiO-66-NH, respectively.
View Article and Find Full Text PDFIn this study, a novel "on-off-enhanced on" approach to highly sensitive rapid sensing of biothiols was developed, based on competitive modulation of gold nanoclusters (AuNCs) and Hg ions. In our approach, the AuNCs were encapsulated into a zeolite imidazole framework (ZIF) for predesigned competitive aggregation-induced luminescence (AIE) emission. To readily operate this approach, the Hg ions were selected as mediators to quench the fluorescence of AuNCs.
View Article and Find Full Text PDFConstructing a suitable heterojunction structure while maintaining a tight interface to promote the separation of photogenerated electrons is of great significance for improving the photocatalytic activity. In this paper, a new PANI/NH-MIL-101(Fe) II-scheme heterojunction was prepared by a hydrothermal method. PANI with a porous structure was firstly obtained by the template method, and then PANI fragments were loaded on the surface of NH-MIL-101(Fe) crystals under hydrothermal conditions to obtain a PANI/NH-MIL-101(Fe) photocatalyst.
View Article and Find Full Text PDFCrit Rev Food Sci Nutr
November 2023
Widespread use of organophosphorus pesticides (OPs), especially superfluous and unreasonable use, had brought huge harm to the environment and food chain. It is because only a small part of the pesticides sprayed reached the target, and the rest slid across the soil, causing pollution of groundwater and surface water resources. These pesticides accumulate in the environment, causing environmental pollution.
View Article and Find Full Text PDFPesticides residues in foodstuffs are longstanding of great concern to consumers and governments, thus reliable evaluation techniques for these residues are necessary to ensure food safety. Emerging ambient ionization mass spectrometry (AIMS), a transformative technology in the field of analytical chemistry, is becoming a promising and solid evaluation technology due to its advantages of direct, real-time and in-situ ionization on samples without complex pretreatments. To provide useful guidance on the evaluation techniques in the field of food safety, we offered a comprehensive review on the AIMS technology and introduced their novel applications for the analysis of residual pesticides in foodstuffs under different testing scenarios (i.
View Article and Find Full Text PDFIn this study, a fluorine-fluorine interaction approach through fluoridating boron nitride nanosheets (BNNs) for sensing perfluoroalkyl acids (PFAAs) in multiple food matrices was developed. Through a facile hydrothermal fluorination modification, the BNNs were transferred into homogeneous fluorinated boron nitride nanoparticles (F-BNNs) with robust networks and specific surface area. After morphological modification, the particles displayed strong adsorption and sensing capabilities on PFAAs in both solid and liquid food matrix.
View Article and Find Full Text PDFSpectrochim Acta A Mol Biomol Spectrosc
December 2021
In this work, an environmentally-friendly and versatile nanobeacon was constructed by utilizing DNA-templated copper nanoparticles (CuNPs) as fluorescence signal source. As the key component of the nanobeacon, a hairpin DNA was designed to contain four segments: two segments for CuNPs template sequence, a target recognition segment and a blocking segment. At room temperature, the target recognition segment partly hybridizes with the blocking segment and thus prohibits the formation of double stranded DNA template, so that no CuNPs can be generated on the hairpin DNA.
View Article and Find Full Text PDFMesoporous melamine-silver (MA-Ag) nanocomposites doped with carbon nitride quantum dots (CN) were fabricated simply by the controlled supramolecular self-assembly. It was discovered that the resulting nanoflower-like CN@MA-Ag nanocomposites could exhibit the peroxidase-like catalysis, which could be specifically enhanced by Hg by forming Ag@Hg alloys. A double catalysis-based colorimetric method was thereby developed for the fast detecting of Hg and Hg in wastewater samples, with the levels down to 0.
View Article and Find Full Text PDFMesoporous silver-melamine (Ag-MA) nanocomposites were synthesized by controlled supramolecular self-assembly with various structural morphologies. It was discovered that the rod-like Ag-MA nanocomposites could present the larger Hg-enhanced catalysis by forming Ag-Hg alloys. Also, they could display large surface-to-volume area and high aqueous stability for the selective Hg enrichment and absorption of Hg ions by yielding the stable coordination complexes.
View Article and Find Full Text PDFIn this work, a simple and highly selective colorimetric method has been developed for quantifying trace-level ATP using FeO nanoparticles (FeO NPs). It was discovered that FeO NPs could present the dramatically enhanced catalysis once anchored with ATP-specific aptamers (Apts), which is about 6-fold larger than that of bare FeO NPs. In the presence of ATP, however, the Apts would be desorbed from FeO NPs due to the Apts-target binding event, leading to the decrease of catalysis rationally depending on ATP concentrations.
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