The interaction between fluorescent gold nanoclusters (AuNCs) and gold nanoparticles (AuNPs) has been investigated. It was observed that the fluorescence of AuNCs was remarkably quenched when direct contact with AuNPs. The fluorescence quenching of AuNCs by AuNPs was dynamic quenching and exhibited size-dependent property. A larger size of AuNPs displayed a stronger quenching effect and gave a larger quenching constant. When a silica spacer shell was introduced between AuNPs and AuNCs, a fluorescence enhancement of AuNCs by Au@SiO NPs was observed. The fluorescence enhancement was strongly dependent on the separation distance between the AuNPs and the AuNCs. A maximal enhancement of 3.72 times was observed when Au@SiO NPs have a silica shell thickness of 12nm. This nanocomposite consisting of relatively nontoxic AuNPs and AuNCs may have a potential application in developing novel fluorescent sensor.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.saa.2017.08.025 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Manipulating Near-Infrared Absorption via Engineering Anisotropic Plasmonic Spiky Au Nanocubes for the Highly Efficient Dual-Response Immune Detection of T-2 Toxin.
Anal Chem
December 2024
College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.
Integrating specific immune recognition, a desirable extinction coefficient, and conspicuous photothermal conversion ability into a single-immune probe to enhance the analysis performance represents an appealing yet significantly challenging task. Herein, by delicately manipulating the geometry of plasmonic nanoparticles from spherical to spiky, precise engineering approach-based spiky Au nanocubes (S-AuNCs) are employed to address this challenge, which fully exploits the plasmon resonance absorption-induced photothermal effect. The finite difference time domain (FDTD) method was employed to computationally simulate the electromagnetic and thermal fields while assessing the feasibility of regulating plasmon resonance for enhanced photothermal absorption.
View Article and Find Full Text PDFMicrofluidic-SERS sensing system based on dual signal amplification and aptamer for gastric cancer detection.
Mikrochim Acta
October 2024
Department of Gastrointestinal Surgery, Jiangdu People's Hospital Affiliated to Yangzhou University, Yangzhou, 225200, P. R. China.
Article Synopsis
- * A microfluidic-SERS sensing system was developed to detect these biomarkers with high sensitivity and specificity using gold-coated iron particles and gold nanocages.
- * The system employs a dual amplification method, combining aptamer binding and magnetic enhancement, achieving detection limits as low as 0.178 pg/mL for MMP-9 and 0.165 pg/mL for IL-6, highlighting its potential for early cancer screening.
Self-assembly of gold nanoparticles into ring-like hierarchical superstructures with tunable interparticle distance.
Soft Matter
October 2024
College of Chemistry, Changchun Normal University, Changchun 130032, China.
Article Synopsis
- Researchers have developed ring-like hierarchical superstructures using polystyrene-tethered gold nanoparticles, focusing on their structural symmetry and unique properties.
- The separation between adjacent nanoparticles in these structures can be adjusted by altering the molecular weight of the tethered polystyrene ligands, while the overall thickness is influenced by the concentration of the nanoparticles.
- This method is versatile and can create various ring-like superstructures with different types of inorganic nanoparticles, suggesting potential applications in fields like surface-enhanced Raman scattering, optoelectronics, and sensor technology.
Au Cluster-Nanoparticle Dual Coupling for Photocatalytic CO Conversion.
Inorg Chem
October 2024
Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241002, P. R. China.
CO-selective photoreduction to value-added products is ideal, but its practical application suffers from weak photogenerated carrier separation and insufficient multielectron transport. Herein, we constructed the tricomponent AuNPs@SnO-AuNCs hybrid by decorating Au nanoclusters (AuNCs) on the Au nanoparticle (AuNPs)@SnO core-shell structure. AuNC-NP dual coupling endowed AuNPs@SnO-AuNCs with an excellent CO yield of 64.
View Article and Find Full Text PDFFortified Dual-Spectral Overlap with Enhanced Colorimetric/Fluorescence Dual-Response Immunochromatography for On-Site Bimodal-Type Gentamicin Monitoring.
J Agric Food Chem
April 2024
College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.
Immunochromatography (ICA) remains untapped toward enhanced sensitivity and applicability for fulfilling the nuts and bolts of on-site food safety surveillance. Herein, we report a fortified dual-spectral overlap with enhanced colorimetric/fluorescence dual-response ICA for on-site bimodal-type gentamicin (Gen) monitoring by employing polydopamine (PDA)-coated AuNPs (APDA) simultaneously serving as a colorimetric reporter and a fluorescence quencher. Availing of the enhanced colorimetric response that originated from the PDA layer, the resultant APDA exhibits less required antibody and immunoprobes in a single immunoassay, which facilitates improved antibody utilization efficiency and immuno-recognition in APDA-ICA.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!