Crystallinity Variation in Seeded Growth of Gold Nanocrystals: the Role of Additive Ag +

2020 ◽  
Vol 5 (15) ◽  
pp. 4447-4453 ◽  
Author(s):  
Gongguo Zhang ◽  
Xiaowei Fu ◽  
Zhiang Liu ◽  
Xiaoqian Luan ◽  
Fengli Qu ◽  
...  
Keyword(s):  
Seeded Growth ◽  
Gold Nanocrystals

Enriching the branching of Au@PdAu core–shell nanocrystals using a syringe pump: kinetics control meets lattice mismatch

CrystEngComm ◽  
2021 ◽  
Vol 23 (13) ◽  
pp. 2582-2589
Author(s):  
Gongguo Zhang ◽  
Yanyun Ma ◽  
Xiaowei Fu ◽  
Wenjun Zhao ◽  
Feng Liu ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Surface Diffusion ◽  
Lattice Mismatch ◽  
Core Shell ◽  
Syringe Pump ◽  
Seeded Growth ◽  
Gold Nanocrystals

Gold@palladium–gold nanocrystals with a tunable branched shape are prepared via seeded growth, where the use of a syringe pump allows the manipulation over reaction kinetics as coupled by surface diffusion and strain caused by lattice mismatch.

Role of shape in substrate-induced plasmonic shift and mode uncovering on gold nanocrystals

Nanoscale ◽  
2016 ◽  
Vol 8 (40) ◽  
pp. 17645-17657 ◽  
Author(s):  
Feng Qin ◽  
Ximin Cui ◽  
Qifeng Ruan ◽  
Yunhe Lai ◽  
Jianfang Wang ◽  
...  
Keyword(s):  
Gold Nanocrystals

One-step seeded growth of monodisperse, quasi-spherical, Tris-stabilized gold nanocrystals with sizes from 17 to 325 nm

CrystEngComm ◽  
2017 ◽  
Vol 19 (2) ◽  
pp. 318-324 ◽  
Author(s):  
Yijing Li ◽  
Peina Zhang ◽  
Junling Duan ◽  
Shiyun Ai ◽  
Houshen Li
Keyword(s):  
Seeded Growth ◽  
Gold Nanocrystals ◽  
One Step

scholarly journals Innovative gold nanoparticle patterning and selective metallization

2013 ◽  
Vol 1547 ◽  
pp. 149-154
Author(s):  
E.S. Kooij ◽  
M.A. Raza ◽  
H.J.W. Zandvliet
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Pure Water ◽  
Water Molecules ◽  
Thiol Groups ◽  
Seeded Growth ◽  
Self Assembled Layer ◽  
High Degree ◽  
Metal Layers

ABSTRACTWe present a simple, novel procedure to selectively deposit gold nanoparticles using pure water. It enables patterning of nanoparticle monolayers with a remarkably high degree of selectivity on flat as well as microstructured oxide surfaces. We demonstrate that water molecules form a thin ‘capping’ layer on exposed thiol molecules within the mercaptan self-assembled layer. This reversible capping of water molecules locally ‘deactivates’ the thiol groups, therewith inhibiting the binding of metallic gold nanoparticles to these specific areas. In addition, we show that this amazing role of water molecules can be used to selectively metalize the patterned gold nanoparticle arrays. Employing an electroless seeded growth process, the isolated seeds are enlarged past the percolation threshold to deposit conducting metal layers.

scholarly journals The Influence of Different Classes of Amino Acids on Calcium Phosphates Seeded Growth

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4798
Author(s):  
Tea Mihelj Josipović ◽  
Monika Kovačević ◽  
Sarah Mateša ◽  
Marina Kostešić ◽  
Nives Matijaković ◽  
...  
Keyword(s):  
Amino Acids ◽  
Calcium Phosphate ◽  
Control Systems ◽  
Aspartic Acid ◽  
Significant Influence ◽  
Calcium Phosphates ◽  
Octacalcium Phosphate ◽  
Seeded Growth ◽  
Material Synthesis

Amino acids (AAs) attract attention for elucidating the role of proteins in biomineralization and the preparation of functionalized biomaterials. The influence that AAs exert on calcium phosphate (CaP) mineralization is still not completely understood, as contradictory results have been reported. In this paper, the influence of the addition of different classes of AAs, charged (L-aspartic acid, Asp; L-lysine, Lys), polar (L-asparagine, Asn; L-serine, Ser; L-tyrosine, Tyr), and non-polar (L-phenylalanine, Phe), on CaP growth in the presence of octacalcium phosphate (OCP) and calcium hydrogenphosphate dihydrate (DCPD) seeds was investigated. In control systems (without AAs), a calcium-deficient apatite (CaDHA) layer was formed on the surface of OCP, while a mixture of CaDHA and OCP in the form of spherical aggregates was formed on the surface of DCPD crystals. Charged and non-polar promoted, while polar AAs inhibited CaDHA formation on the OCP seeds. In the case of DCPD, Lys, Asp, and Phe promoted CaP formation, while the influence of other AAs was negligible. The most efficient promotor of precipitation in both cases was non-polar Phe. No significant influence of AAs on the composition and morphology of precipitates was observed. The obtained results are of interest for understanding biomineralization processes and additive controlled material synthesis.

Theoretical description of the role of amine surfactant on the anisotropic growth of gold nanocrystals

CrystEngComm ◽  
2016 ◽  
Vol 18 (21) ◽  
pp. 3934-3941 ◽  
Author(s):  
Hongjun You ◽  
Xiaotong Liu ◽  
Hongzhong Liu ◽  
Jixiang Fang
Keyword(s):  
Theoretical Description ◽  
Anisotropic Growth ◽  
Gold Nanocrystals

Size Control of Gold Nanocrystals in Citrate Reduction:  The Third Role of Citrate

2007 ◽  
Vol 129 (45) ◽  
pp. 13939-13948 ◽  
Author(s):  
Xiaohui Ji ◽  
Xiangning Song ◽  
Jun Li ◽  
Yubai Bai ◽  
Wensheng Yang ◽  
...  
Keyword(s):  
Size Control ◽  
Gold Nanocrystals ◽  
The Third ◽  
Citrate Reduction

scholarly journals Effect of size and position of gold nanocrystals embedded in gate oxide of SiO2/Si MOS structures

2016 ◽  
Vol 06 (01) ◽  
pp. 1650001 ◽  
Author(s):  
Chaitali Chakraborty ◽  
Chayanika Bose
Keyword(s):  
Oxide Semiconductor ◽  
Internal Electric Field ◽  
Interface Traps ◽  
Gold Nanocrystals ◽  
Simulation Tools ◽  
Voltage Curve ◽  
Capacitance Voltage ◽  
Mos Structures ◽  
Mos Device

The influence of single and double layered gold (Au) nanocrystals (NC), embedded in SiO2 matrix, on the electrical characteristics of metal–oxide–semiconductor (MOS) structures is reported in this communication. The size and position of the NCs are varied and study is made using Sentaurus TCAD simulation tools. In a single NC-layered MOS structure, the role of NCs is more prominent when they are placed closer to SiO2/Si[Formula: see text]substrate interface than to SiO2/Al–gate interface. In MOS structures with larger NC dots and double layered NCs, the charge storage capacity is increased due to charging of the dielectric in the presence of NCs. Higher breakdown voltage and smaller leakage current are also obtained in the case of dual NC-layered MOS device. A new phenomenon of smearing out of the capacitance–voltage curve is observed in the presence of dual NC layer indicating generation of interface traps. An internal electric field developed between these two charged NC layers is expected to generate such interface traps at the SiO2/Si interface.

scholarly journals Micelle-directed chiral seeded growth on anisotropic gold nanocrystals

Science ◽  
2020 ◽  
Vol 368 (6498) ◽  
pp. 1472-1477 ◽  
Author(s):  
Guillermo González-Rubio ◽  
Jesús Mosquera ◽  
Vished Kumar ◽  
Adrián Pedrazo-Tardajos ◽  
Pablo Llombart ◽  
...  
Keyword(s):  
Gold Nanorods ◽  
Near Infrared ◽  
Mixed Micelles ◽  
Electromagnetic Spectrum ◽  
Seeded Growth ◽  
Gold Nanocrystals ◽  
Direct Seeded ◽  
Templating Effect ◽  
Surfactant Assisted ◽  
Plasmon Modes

Surfactant-assisted seeded growth of metal nanoparticles (NPs) can be engineered to produce anisotropic gold nanocrystals with high chiroptical activity through the templating effect of chiral micelles formed in the presence of dissymmetric cosurfactants. Mixed micelles adsorb on gold nanorods, forming quasihelical patterns that direct seeded growth into NPs with pronounced morphological and optical handedness. Sharp chiral wrinkles lead to chiral plasmon modes with high dissymmetry factors (~0.20). Through variation of the dimensions of chiral wrinkles, the chiroptical properties can be tuned within the visible and near-infrared electromagnetic spectrum. The micelle-directed mechanism allows extension to other systems, such as the seeded growth of chiral platinum shells on gold nanorods. This approach provides a reproducible, simple, and scalable method toward the fabrication of NPs with high chiral optical activity.

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