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- South China University of Technology
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Dual-Color Plasmonic Nanosensor for Radiation Dosimetry
摘要： Radiation dosimeters are critical for accurately assessing the levels of radiation exposure of tumor sites and surrounding tissues and for optimizing therapeutic interventions as well as for monitoring environmental exposure. To fill the need for a simple, user-friendly and inexpensive dosimeter, we designed an innovative colorimetric nanosensor-based assay for detecting ionizing radiation. We show that hydroxyl radicals generated by ionizing radiation can be used to etch gold nanorods (AuNRs) and silver nanoprisms (AgNPRs), yielding reproducible color changes for radiation dose detection in the range of 50-2000 Rad, broad enough to cover doses used in hyperfractionated, conventional, and hypofractionated radiotherapy. This range of doses detected by this assay correlates with radiation induced DNA damage response in mammalian cells. Furthermore, this AuNR- and AgNPR-based sensing platform has been established in a paper format that can be readily adopted for a wide range of applications and translation.
关键词： Radiation dosimetry,gold nanorods,silver nanoprisms,dual-color nanosensor,colorimetric detection
更新于2025-09-23 15:19:57
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TD-DFT+TB: An Efficient and Fast Approach for Quantum Plasmonic Excitations
摘要： We study the quantum plasmonic features of gold and silver nanoparticles using TD-DFT+TB, a new density functional theory approach to the calculation of excited states, which combines a full DFT ground state with tight-binding approximations in the linear response calculation. In this framework, the optical properties of closed-shell Ag, Au and bimetallic Ag-Au nanoparticles with tetrahedral symmetry (with 20, 56, 120 and 165 atoms) and icosahedral structure (with 13, 55 and 147 atoms) were obtained and compared to full linear response time-dependent density functional theory (TD-DFT) as a reference and also time-dependent density functional based tight binding (TD-DFTB) as a low-cost alternative approach. We find an excellent agreement of TD-DFT+TB calculated absorption spectra with the TD-DFT reference with errors less than 0.15 eV in peak positions, while TD-DFTB shows larger errors of about 1 eV. The computational cost for the ground state calculation is identical for TD-DFT and TD-DFT+TB, but the excited state calculation becomes about a hundred times faster when applying the TB approximation and is then almost negligible for the overall timing of the calculation. In contrast to TD-DFTB, which can only be applied to element combinations for which a suitable DFTB parametrization is available, TD-DFT+TB can be applied to any combination of elements. To assess the accuracy of TD-DFT+TB for different combinations of atoms, the plasmonic properties of bimetallic clusters with different ratios of Ag and Au atoms were obtained and the trend of energy and intensity reproduced in good agreement with TD-DFT, which is not possible using TD-DFTB with standard parameter sets.
关键词： quantum plasmonic,bimetallic Ag-Au nanoparticles,gold and silver nanoparticles,optical properties,TD-DFT+TB
更新于2025-09-23 15:19:57
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[IEEE 2018 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech) - Saint Petersburg, Russia (2018.10.22-2018.10.23)] 2018 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech) - Porous Silicon as a Material for Nanocomposites and the Effect of its Parameters on the Morphology of Silver Clusters
摘要： On the example of the por-Si/Ag composites it is demonstrated the ability to control the morphology of the guest material (Ag) by changing the parameters of the porous media (por-Si). Two groups of key parameters of porous materials important for creating composites based on them are discussed. Porous silicon was obtained by electrochemical anodic etching. The introducing Ag into the pores was performed by the cathodic electrochemical deposition. It is observed the increasing the anodizing time is leads to the noticeably changes of wetting angle of por-Si, and, in turn, significantly affects the morphology of Ag clusters. The growth mechanisms of Ag clusters on the por-Si surface and the fields of its potential application are discussed.
关键词： porous texture,surface properties,porous silicon composites,por-Si/Ag composites,electrochemical deposition,surface functionality,silver clusters
更新于2025-09-23 15:19:57
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Rice–Bernasconi Gorkov–Eliashberg Effect of Giant Dielectric Permittivity in Silica-Based Films Containing Interrupted Silver Nanowires
摘要： Silver nanowires of diameter * 5 nm were grown within thick ?lms (0.6 lm thickness) of sol–gel-derived xAg2O(1 - x)SiO2; x having values of 30 and 40, respectively, by an electrodeposition method. By applying suitable voltage pulses to the composites, interrupted silver nanowires were produced with lengths having values in the range 4000–5000 nm. The samples exhibited dielectric constant with values of the order of 105 and a low dielectric loss (* 0.01). The dielectric constant values calculated by using Rice–Bernasconi model which originated from Gorkov–Eliashberg theory of metallic nanoparticles were in satisfactory agreement with the experimental results. The present work not only provides strong evidence for the basis of Rice–Bernasconi model but also opens up a simple method to synthesize high dielectric constant materials which will be useful in fabricating devices for very large-scale integration applications, among others.
关键词： Interrupted silver nanowires,Electrodeposition,Nanocomposite,Rice–Bernasconi model
更新于2025-09-23 15:19:57
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Rapid and selective detection of trace Cu2+ by accumulation- reaction-based Raman spectroscopy
摘要： Developing detection method for trace copper ions (Cu2+) has attracted great attention since Cu2+ ions would threaten to human health, including cellular toxicity, liver damage, and neuro degenerative diseases. In this work, adding L-cysteine (L-Cys) into inositol hexaphosphate (IP6) modi?ed Ag nanoparticles (designated as L-Cys/IP6@Ag) induces the certain aggregation of nanoparticles, resulting in increasng the surface enhanced Raman scattering (SERS) signal of rhodamine 6 G (R6 G). The presence of Cu2+ ions could be adsorbed by IP6 and the concentrated Cu2+ ions could further selectively oxide Cys molecules under certain pH value, which disperses the IP6@Ag again and decreases the SERS signal of R6 G. The linear range of determination of Cu2+ ions is from 10-5 to 10-1° M as well as a low detection concentration is of 10 pM. Furthermore, the L-Cys/IP6@Ag-R6 G-based SERS sensor has been successfully applied to detect trace Cu2+ in river water.
关键词： Trace Cu2+,Silver nanoparticles,Raman,Inositol hexaphosphate,L-cysteine
更新于2025-09-23 15:19:57
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Photo-electrochemical Behavior of Silver Nanoparticles inside Mesoporous Titania: Plasmon induced charge separation effect
摘要： The self-assembly block copolymer method was used to synthesize mesoporous titania films and silver nanoparticles (NPs) were grown inside the films. Such silver NPs-titania films are known for their multicolor photochromic properties, due to a photo-oxidation reaction of silver in the presence of titania under light excitation which is attributed to a plasmon induced charge separation (PICS). Here, the photo-electrochemical properties of these composite films have been investigated at different light wavelengths and chemical environment in order to characterize the light-induced redox reactivity modifications. Cyclic voltammetry (CV) study shows that the Ag+ electro-reduction peak potential varies depending on the light irradiation, which determines the state of the silver nanoparticles complexed or not by titania.
关键词： cyclic voltammetry,Silver nanoparticles,photochromism,plasmon,mesoporous titania
更新于2025-09-19 17:15:36
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An Environmentally Friendly Method for Testing Photocatalytic Inactivation of Cyanobacterial Propagation on a Hybrid Ag-TiO2 Photocatalyst under Solar Illumination
摘要： Cyanobacteria were inactivated under sunlight using mixed phase silver (Ag) and deposited titanium dioxide (TiO2) coated on the surface of diatomite (DM) as a hybrid photocatalyst (Ag-TiO2/DM). The endpoints of dose-response experiments were chlorophyll a, photosynthetic efficiency, and flow cytometry measurements. In vitro experiments revealed that axenic cultures of planktonic cyanobacteria lost their photosynthetic activity following photocatalyzed exposure to sunlight for more than 24 h. Nearly 92% of Microcystis aeruginosa cells lost their photosynthetic activity, and their cell morphology was severely damaged within 24 h of the reaction. Preliminary carbon-14 (14CO3^2-) results suggest that the complete inactivation of cyanobacteria arises from damage to cell wall components (peroxidation). A small concomitant increase in cell wall disorder and a consequent decrease in cell wall functional groups increase the cell wall fluidity prior to cell lysis. A high dosage of Ag-TiO2/DM during photocatalysis increased the concentration of extracellular polymeric substances (EPSs) in the Microcystis aeruginosa suspension by up to approximately 260%. However, photocatalytic treatment had a small effect on the disinfection by-product (DBP) precursor, as revealed by only a slight increase in the formation of trihalomethanes (THMs) and haloacetic acids (HAAs).
关键词： titanium dioxide,silver,extracellular polymeric substances,photocatalysis,disinfection by-products,cyanobacteria
更新于2025-09-19 17:15:36
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A thirty-fold photoluminescence enhancement induced by secondary ligands in monolayer protected silver clusters
摘要： In this paper, we demonstrate that systematic replacement of the secondary ligand PPh3 leads to an enhancement in the near-infrared (NIR) photoluminescence (PL) of [Ag29(BDT)12(PPh3)4]3?. While the replacement of PPh3 with other monophosphines enhances luminescence slightly, the replacement with diphosphines of increasing chain length leads to a drastic PL enhancement, as high as 30 times compared to the parent cluster, [Ag29(BDT)12(PPh3)4]3?. Computational modeling suggests that the emission is a ligand to metal charge transfer (LMCT) which is affected by the nature of the secondary ligand. Control experiments with systematic replacement of the secondary ligand confirm its influence on the emission. The excited state dynamics shows this emission to be phosphorescent in nature which arises from the triplet excited state. This enhanced luminescence has been used to develop a prototypical O2 sensor. Moreover, a similar enhancement was also found for [Ag51(BDT)19(PPh3)3]3?. The work presents an easy approach to the PL enhancement of Ag clusters for various applications.
关键词： photoluminescence enhancement,phosphorescence,secondary ligands,silver clusters,O2 sensor
更新于2025-09-19 17:15:36
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Amphiphilicity Regulation of Ag(I) Nanoclusters: Self-Assembly and its Application as Luminescent Probe
摘要： Research on the self-assembly of various amphiphilic molecules is relatively hot and of great significance. However, new kind of metal nanoclusters (NCs) based amphiphilic molecule has rarely been explored. Herein, hydrophobic cations 1-hexadecyl-3-methylimidazolium (C16mim+) were chosen to modify hydrophilic (NH4)6[Ag6(mna)6] (Ag6-NCs, H2mna = 2-mercaptonicotinic acid) and Ag6@C16mim-NCs were obtained. Ag6@C16mim-NCs performed a thermotropic liquid crystal and thermofluorescence property. Moreover, the Ag6@C16mim-NCs exhibits benign amphiphilicity which could self-assembly into ordered nanosheets and nanorods aggregates in water/dimethyl sulfoxide (DMSO) binary solvents while single Ag6-NCs does not. Meanwhile, the Ag6@C16mim-NCs also performs aggregation-induced emission (AIE) property owing to the restriction of intramolecular vibration of the capping ligands. Furthermore, it can be found that the luminescent aggregates could detect arginine selectively with the detection limit (DL) at 28 uM. This study introduced a new kind of metal NCs-based amphiphilic molecule in a supramolecular self-assembly field and make it a candidates as optical materials in applied research.
关键词： Silver (I) nanocluster,aggregation-induced emission,self-assembly,amphiphilicity,sensor
更新于2025-09-19 17:15:36
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Tunable local surface plasmon resonance and refractive index sensitivity ability of three-layered dielectric-silver bimetallic nanoshells
摘要： Optical properties and refractive index sensitivity abilities of three-layered silver/gold-dielectric-silver bimetallic nanoshells are investigated based on quasi-static theory. The results show that absorption spectra of silver/gold-dielectric-silver bimetallic nanoshells can be well tuned by changing the inner core radius, middle dielectric radius and outer shell layer thickness. Local surface plasmon resonance (LSPR) shifts of |ω? ?? mode show a red-shift with increasing the inner core radius and the thickness of middle dielectric layer, while a blue-shift with increasing the thickness of outer shell. It is interesting to find that the shifts of |ω+ ?? mode are related to the ratio ε2∕ε4, the component of core and nanoshell. In addition, the refractive index sensitivity abilities of three-layered silver/gold-dielectric-silver bimetallic nanoshells are also reported. A higher refractive index sensitivity ability can be obtained by adjusting its geometric size and component. |ω? ?? mode gets more intensity with increasing the surrounding medium dielectric function, while |ω+ ?? mode fades down. The intensity difference between |ω? ?? mode and |ω+ ?? mode is mainly effected by the surrounding medium dielectric function, its geometric parameter, middle layer dielectric function, the component of core and nanoshell. Our study provides a way to analyze sensitivity application of nanoshells and broadens the application of nanoshells in sensor ability.
关键词： Plasmon hybridization theory,Local surface plasmon resonance (LSPR),Dielectric-silver bimetallic nanoshells,Refractive index sensitivity ability
更新于2025-09-19 17:15:36