Dopants in the Design of Noble Metal Nanoparticle Electrocatalysts and their Effect on Surface Energy and Coordination Chemistry at the Nanocrystal Surface

2021 ◽  
pp. 2100265
Author(s):  
Taehyun Kwon ◽  
Taekyung Kim ◽  
Yunchang Son ◽  
Kwangyeol Lee
2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Giyaullah Habibullah ◽  
Jitka Viktorova ◽  
Tomas Ruml

AbstractNoble metals have played an integral part in human history for centuries; however, their integration with recent advances in nanotechnology and material sciences have provided new research opportunities in both academia and industry, which has resulted in a new array of advanced applications, including medical ones. Noble metal nanoparticles (NMNPs) have been of great importance in the field of biomedicine over the past few decades due to their importance in personalized healthcare and diagnostics. In particular, platinum, gold and silver nanoparticles have achieved the most dominant spot in the list, thanks to a very diverse range of industrial applications, including biomedical ones such as antimicrobial and antiviral agents, diagnostics, drug carriers and imaging probes. In particular, their superior resistance to extreme conditions of corrosion and oxidation is highly appreciated. Notably, in the past two decades there has been a tremendous advancement in the development of new strategies of more cost-effective and robust NMNP synthesis methods that provide materials with highly tunable physicochemical, optical and thermal properties, and biochemical functionalities. As a result, new advanced hybrid NMNPs with polymer, graphene, carbon nanotubes, quantum dots and core–shell systems have been developed with even more enhanced physicochemical characteristics that has led to exceptional diagnostic and therapeutic applications. In this review, we aim to summarize current advances in the synthesis of NMNPs (Au, Ag and Pt).


2019 ◽  
Vol 463 ◽  
pp. 968-975 ◽  
Author(s):  
N. Nedyalkov ◽  
M.E. Koleva ◽  
R. Nikov ◽  
N.E. Stankova ◽  
E. Iordanova ◽  
...  

2019 ◽  
Vol 538 ◽  
pp. 569-577 ◽  
Author(s):  
Jianhao Qiu ◽  
Xingguang Zhang ◽  
Kailuo Xie ◽  
Xiong-Fei Zhang ◽  
Yi Feng ◽  
...  

2019 ◽  
Vol 10 ◽  
pp. 1038-1047 ◽  
Author(s):  
Zaid K Alghrair ◽  
David G Fernig ◽  
Bahram Ebrahimi

The influenza (“flu”) type-A virus is a major medical and veterinary health concern and causes global pandemics. The peptide “FluPep” is an established inhibitor of influenza virus infectivity in model systems. We have explored the potential for noble-metal nanoparticle conjugates of FluPep to enhance its antiviral activity and to determine their potential as a delivery platform for FluPep. FluPep ligand is FluPep extended at its N-terminus with the sequence CVVVTAAA, to allow for its incorporation into a mixed-matrix ligand shell of a peptidol and an alkanethiol ethylene glycol consisting of 70% CVVVTol and 30% HS(CH2)11(OC2H4)4OH (mol/mol). Gold and silver nanoparticles (ca. 10 nm diameter) with up to 5% (mol/mol) FluPep ligand remained as stable as the control of mixed-matrix-passivated nanoparticles in a variety of tests, including ligand exchange with dithiothreitol. The free FluPep ligand peptide was found to inhibit viral plaque formation in canine MDCK cells (IC50 = 2.1 nM), but was less potent than FluPep itself (IC50 = 140 pM). Nanoparticles functionalised with FluPep ligand showed enhanced antiviral activity compared to the free peptides. The IC50 value of the FluPep-functionalised nanoparticles decreased as the grafting density of FluPep ligand increased from 0.03% to 5% (both mol/mol), with IC50 values down to about 10% of that of the corresponding free peptide. The data demonstrate that conjugation of FluPep to gold and silver nanoparticles enhances its antiviral potency; the antimicrobial activity of silver ions may enable the design of even more potent antimicrobial inhibitors, capable of targeting both influenza and bacterial co-infections.


2014 ◽  
Vol 07 (05) ◽  
pp. 1450064 ◽  
Author(s):  
Haiyan He ◽  
Ping Yang ◽  
Changchao Jia ◽  
Yanping Miao ◽  
Jie Zhao ◽  
...  

TiO 2 nanobelts have been fabricated through a hydrothermal method and subsequently sulfuric-acid-corrosion-treated for a rough surface. Noble metal nanoparticles such as Ag and Au were deposited on the coarse surface of TiO 2 nanobelts via a coprecipitation procedure. Ag – TiO 2 nanobelts were prepared in ethanolic solution contained silver nitrate ( AgNO 3) and sodium hydroxide ( NaOH ). Au – TiO 2 nanobelts were obtained in chloroauric acid ( HAuCl 4) using sodium borohydride ( NaBH 4) as the reductant. It is confirmed by the results of XRD patterns together with the SEM images that the composite of noble metal and TiO 2 nanobelts were obtained successfully and the Ag or Au nanoparticles were well-dispersed on the TiO 2 nanobelts. Moreover, the as-prepared Ag and Au nanoparticle-decorated TiO 2 nanobelts represent an enhanced photocatalytic activity compared with pure TiO 2 nanobelts, which is due to the fact that the Ag and Au nanoparticles on the surface of TiO 2 nanobelts act as sinks for the photogenerated electrons and promote the separation of the electrons and holes.


2020 ◽  
Vol 44 (38) ◽  
pp. 16613-16625
Author(s):  
Radha Bhardwaj ◽  
Venkatarao Selamneni ◽  
Uttam Narendra Thakur ◽  
Parikshit Sahatiya ◽  
Arnab Hazra

In the current study, noble metal nanoparticle functionalized MoS2 coated biodegradable low-cost paper sensors were fabricated for the selective detection of low concentrations of volatile organic compounds (VOCs).


2020 ◽  
Vol 146 ◽  
pp. 790-797 ◽  
Author(s):  
Laura Chronopoulou ◽  
Francesca A. Scaramuzzo ◽  
Raoul Fioravanti ◽  
Antonio di Nitto ◽  
Sara Cerra ◽  
...  

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