scholarly journals Time dependence of electrical characteristics during the charge decay from a single gold nanoparticle on silicon

RSC Advances ◽  
2020 ◽  
Vol 10 (68) ◽  
pp. 41741-41746
Author(s):  
Yawar Abbas ◽  
Ayman Rezk ◽  
Irfan Saadat ◽  
Ammar Nayfeh ◽  
Moh'd Rezeq

In this work, we investigate the time dependence of trapped charge in isolated gold nanoparticles (Au-NPS) dispersed on n-Si substrates, based on the electrical characteristics of nano metal–semiconductor junctions.

2020 ◽  
Vol 8 (45) ◽  
pp. 16198-16203
Author(s):  
Yinfeng Long ◽  
Shuangshuang Wang ◽  
Yunxia Wang ◽  
Yan Qiao ◽  
Tao Ding

Surface plasmons enable controllable shape transformation based on the dissolution and re-deposition of gold nanoparticles (Au NPs).


RSC Advances ◽  
2015 ◽  
Vol 5 (28) ◽  
pp. 21511-21514 ◽  
Author(s):  
Tanuja Yeluri ◽  
Namdev V. Ghule ◽  
Rajesh S. Bhosale ◽  
Mohammad Al Kobaisi ◽  
Sheshanath V. Bhosale ◽  
...  

A gold nanoparticle (Au NP) system based on interaction between cyclam and Au NPs resulted into well defined wheel like supramolecular nanostructures in the presence of Cd2+.


2020 ◽  
Vol 2 (1) ◽  
pp. 166-170
Author(s):  
Kasturi Sahu ◽  
Sruti Mondal ◽  
Bratati Patra ◽  
Tanmoy Pain ◽  
Sajal Kumar Patra ◽  
...  

The newly synthesized bis(thiocyanato)-triphenylcorrole has turned out to be a good corrole based precursor for the facile synthesis of thiol protected gold nanoparticles (Au NPs).


2021 ◽  
Vol 21 (2) ◽  
pp. 921-927
Author(s):  
Guangning You ◽  
Shuping Xu ◽  
Xingfei Yao ◽  
Huanhuan Wu ◽  
Yingying Shi

Silk fibroin was used as a stabilizer for gold nanoparticles, and a direct silk fibroin-gold nanoparticle composite system was prepared by a direct compounding method in this paper. The stability of Au NPs/SF in phosphate buffer solution with different pH and KCl concentration was studied. The Au NPs/SF system was characterized by UV-visible light spectrum, transmission electron microscope and infrared spectrum. The silk fibroin-gold nanoparticle composite system was prepared by in situ reduction of chloroauric acid with silk fibroin, according to the change of solution color and the change of ultraviolet absorption peak. The effects of exogenous factors on the stability of the silk fibroin-gold nanoparticle in situ composite system were initially discussed, and its inhibition in breast cancer-bearing animal models was studied. In vivo experiments show that in situ injection of Au NPs/SF nanofibers and treatment with light can effectively control tumor growth. Compared with monodisperse gold nanoparticles, silk fibroin-gold nanoparticles can kill tumor cells and inhibit tumor tissue growth more effectively.


2021 ◽  
Author(s):  
Aditya lawerence Toppo ◽  
Satya Eswari Jujjavarapu

Abstract Gold nanoparticles due to their specific properties and function have found uses in the field of engineering to medical sciences. The Gold nanoparticles are always used in conjugation with other chemicals, metals, proteins, and other organic materials. The addition of other conjugates enhances the properties of Gold nanoparticles. As the insertion of metal nanoparticles into an organic matrix effectively increases the specific surface area of such materials, thereby enhancing the desired properties of the material. The term nanocomposite(NCs) is used for material containing an inorganic moiety, with at least one dimension in a nanometre range of 1–100 nm(nanoparticles ) and other materials like metal, ceramics, and polymers. The term “Bionanocomposite" (BNCs)has been assigned to nanocomposites containing a component of biological origin in the mixture. In this work, Bamboo (Bambusa bambos) was used as the organic matrix for the preparation of gold nanoparticle biochar (Au-NPs/BC) nanocomposite. The one-step synthesis approach was used for the treatment of Bamboo with Auric Chloride Salt at room temperature. In addition to the above process, the bamboo was also pyrolyzed at low temperature after treatment, which helped further to reduce the overall cost of the method. This made the method of preparation of the nanocomposite low cost and eco-friendly. Various analytical techniques such as Fourier transform infrared (FT-IR), X‐ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive X‐ray spectroscopy (EDS), and UV–Vis spectroscopy methods were used for the characterization of the synthesized nanocomposite. This nanocomposite was used for the preparation of electrodes and its electrical conductivity was tested. In this method, the nanocomposite was prepared in a good amount via a very simple methodology. The characterization revealed the presence of gold in the nanocomposite, which confirms that this method can be used for the preparation of the (Au-NPs/BC) nanocomposite.


2020 ◽  
Vol 16 (2) ◽  
pp. 204-213 ◽  
Author(s):  
Melissa A. Vetten ◽  
Mary Gulumian

Background: Endotoxin-free engineered nanoparticle suspensions are imperative for their successful applications in the field of nanomedicine as well as in the investigations in their toxicity. Gold nanoparticles are known to interfere with various in vitro assays due to their optical properties and potential for surface reactivity. In vitro endotoxin testing assays are known to be susceptible to interference caused by the sample being tested. Objective: This study aimed to identify a preferred assay for the testing of endotoxin contamination in gold nanoparticle suspensions. Methods: The interference by gold nanoparticles on three assays namely, the commonly used limulus amebocyte lysate chromogenic assay, the limulus amebocyte lysate gel-clot method, and the less common recombinant Factor C (rFC) assay, was tested. Results: Possible interference could be observed with all three assays. The interference with the absorbance- based chromogenic assay could not be overcome by dilution; whilst the qualitative nature of the gel-clot assay excluded the possibility of distinguishing between a false positive result due to enhancement of the sensitivity of the assay, and genuine endotoxin contamination. However, interference with the rFC assay was easily overcome through dilution. Conclusion: The rFC assay is recommended as an option for endotoxin contamination detection in gold nanoparticle suspensions.


2021 ◽  
Author(s):  
Salvatore Moschetto ◽  
Andrea Ienco ◽  
Gabriele Manca ◽  
Manuel Serrano-Ruiz ◽  
Maurizio Peruzzini ◽  
...  

Heterostructures of single- and few-layer black phosphorus (2D bP) functionalized with gold nanoparticles (Au NPs) have been recently reported in the literature, exploiting their intriguing properties and biocompatibility for catalytic,...


Author(s):  
Spyridon Damilos ◽  
Ioannis Alissandratos ◽  
Luca Panariello ◽  
Anand N. P. Radhakrishnan ◽  
Enhong Cao ◽  
...  

AbstractA continuous manufacturing platform was developed for the synthesis of aqueous colloidal 10–20 nm gold nanoparticles (Au NPs) in a flow reactor using chloroauric acid, sodium citrate and citric acid at 95 oC and 2.3 bar(a) pressure. The use of a two-phase flow system – using heptane as the continuous phase – prevented fouling on the reactor walls, while improving the residence time distribution. Continuous syntheses for up to 2 h demonstrated its potential application for continuous manufacturing, while live quality control was established using online UV-Vis photospectrometry that monitored the particle size and process yield. The synthesis was stable and reproducible over time for gold precursor concentration above 0.23 mM (after mixing), resulting in average particle size between 12 and 15 nm. A hydrophobic membrane separator provided successful separation of the aqueous and organic phases and collection of colloidal Au NPs in flow. Process yield increased at higher inlet flow rates (from 70 % to almost 100 %), due to lower residence time of the colloidal solution in the separator resulting in less fouling in the PTFE membrane. This study addresses the challenges for the translation of the synthesis from batch to flow and provides tools for the development of a continuous manufacturing platform for gold nanoparticles.Graphical abstract


2021 ◽  
Author(s):  
Yiren Cao ◽  
Jinjun Wu ◽  
Bo Pang ◽  
Hongquan Zhang ◽  
X. Chris Le

The trans-cleavage activity of the target-activated CRISPR-Cas12a liberated an RNA crosslinker from a molecular transducer, which facilitated assembly of gold nanoparticles. Integration of the molecular transducer with isothermal amplification and...


2021 ◽  
Author(s):  
Min Chen ◽  
Leiqing Pan ◽  
K. Tu

A simple and quick responsive fluorescent biosensor for Salmonella typhimurium detection based on the recognition of aptamer coupled with alendronic acid (ADA)@upconversion nanoparticles (UCNPs) and gold nanoparticle (AuNPs) has been...


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