Shape-selective one-step synthesis of branched gold nanoparticles on the crystal surface of redox-active PdII-macrocycles

2022 ◽  
Author(s):  
Yutaro Yamashita ◽  
Shohei Tashiro ◽  
Yoshiki Ishii ◽  
Takayuki Uchihashi ◽  
Nobuyuki Matsushita ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
Formation Mechanism ◽  
Crystal Surface ◽  
Effective Control ◽  
Protective Agents ◽  
Redox Active ◽  
Shape Selective ◽  
One Step ◽  
Shape And Size

The synthesis of branched gold nanoparticles (AuNPs) with shape- and size-specific optical properties requires effective control of the particle formation mechanism using appropriate reducing agents and protective agents that prevent...

Controllable synthesis and SERS characteristics of hollow sea-urchin gold nanoparticles

2014 ◽  
Vol 16 (46) ◽  
pp. 25601-25608 ◽  
Author(s):  
Junpeng Li ◽  
Jun Zhou ◽  
Tao Jiang ◽  
Binbing Wang ◽  
Min Gu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
Sea Urchin ◽  
Galvanic Replacement ◽  
Controllable Synthesis ◽  
Replacement Strategy ◽  
One Step

Hollow sea-urchin gold nanoparticles with distinctive optical properties were prepared through a one-step galvanic replacement strategy.

Growth and formation mechanism of shape-selective preparation of ZnO structures: correlation of structural, vibrational and optical properties

2020 ◽  
Vol 22 (14) ◽  
pp. 7329-7339 ◽  
Author(s):  
M. Montero-Muñoz ◽  
J. E. Ramos-Ibarra ◽  
J. E. Rodríguez-Páez ◽  
G. E. Marques ◽  
M. D. Teodoro ◽  
...  
Keyword(s):  
Optical Properties ◽  
Formation Mechanism ◽  
Preparation Method ◽  
Particle Sizes ◽  
Surface Areas ◽  
Shape Selective ◽  
Distinct Particle

A shape-selective preparation method was used to obtain highly crystalline rod-, needle-, nut-, and doughnut-like ZnO morphologies with distinct particle sizes and surface areas.

scholarly journals Overgrowth and Crystalline Structure of Gold Nanorods

2012 ◽  
Vol 18 (S5) ◽  
pp. 67-68 ◽  
Author(s):  
J. B. Rodríguez-González ◽  
E. Carbó-Argibay ◽  
I. Pastoriza-Santos ◽  
J. Pérez-Juste ◽  
L.M. Liz-Marzán
Keyword(s):  
Gold Nanoparticles ◽  
Single Crystal ◽  
Crystalline Structure ◽  
Gold Nanorods ◽  
Morphology Control ◽  
Building Blocks ◽  
Effective Control ◽  
Tight Control ◽  
Nanostructured Systems ◽  
Shape And Size

The effective control over the behavior of nanostructured systems requires a tight control over the shape and size of the nanoparticle building blocks. This control can be very effective and useful in the case of crystalline gold nanoparticles. In order to achieve a precise morphology control over the particles obtained using gold nanorods as seeds; we have studied the crystalline structure of the initial single-crystal gold nanorods, which can be used in subsequent overgrowth processes. We also studied the mechanisms involved in the overgrowth and reshaping of such gold nanorods.

High Density Gold Nanoparticles Within Three-Dimensionally Mesoporous SBA-15: Adsorption Behavior and Optical Properties

2015 ◽  
Vol 15 (9) ◽  
pp. 7060-7067 ◽  
Author(s):  
Xiaojuan Wang ◽  
Xiaoqing Yan ◽  
Renhong Li ◽  
Liping Xiao ◽  
Guicen Ma ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
High Density ◽  
Adsorption Behavior

scholarly journals Rapid electrochemical detection of coronavirus SARS-CoV-2

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Thanyarat Chaibun ◽  
Jiratchaya Puenpa ◽  
Tatchanun Ngamdee ◽  
Nimaradee Boonapatcharoen ◽  
Pornpat Athamanolap ◽  
...  
Keyword(s):  
Electrochemical Biosensor ◽  
Rolling Circle Amplification ◽  
Clinical Samples ◽  
Rolling Circle ◽  
Qrt Pcr ◽  
Reverse Transcription Pcr ◽  
Sandwich Hybridization ◽  
Redox Active ◽  
One Step ◽  
The One

AbstractCoronavirus disease 2019 (COVID-19) is a highly contagious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Diagnosis of COVID-19 depends on quantitative reverse transcription PCR (qRT-PCR), which is time-consuming and requires expensive instrumentation. Here, we report an ultrasensitive electrochemical biosensor based on isothermal rolling circle amplification (RCA) for rapid detection of SARS-CoV-2. The assay involves the hybridization of the RCA amplicons with probes that were functionalized with redox active labels that are detectable by an electrochemical biosensor. The one-step sandwich hybridization assay could detect as low as 1 copy/μL of N and S genes, in less than 2 h. Sensor evaluation with 106 clinical samples, including 41 SARS-CoV-2 positive and 9 samples positive for other respiratory viruses, gave a 100% concordance result with qRT-PCR, with complete correlation between the biosensor current signals and quantitation cycle (Cq) values. In summary, this biosensor could be used as an on-site, real-time diagnostic test for COVID-19.

Redox-active polymer-nanoparticle hybrid materials

2000 ◽  
Vol 72 (1-2) ◽  
pp. 67-72 ◽  
Author(s):  
Keith J. Watson ◽  
Jin Zhu ◽  
SonBinh T. Nguyen ◽  
Chad A. Mirkin
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymers ◽  
Hybrid Materials ◽  
Ring Opening ◽  
Gel Permeation Chromatography ◽  
Polymer Chains ◽  
Electrochemical Studies ◽  
Redox Active ◽  
Gel Permeation ◽  
Current Rectification

Ring-opening metathesis polymerization was used to modify organic soluble gold nanoparticles with redox-active polymers. A gel-permeation chromatography study revealed that each nanoparticle is modified with approximately 11 polymer chains. Electrochemical studies of nanoparticles modified with block copolymers of two different redox-active groups revealed that each monomer is electrochemically accessible, while no current rectification was observed.

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