Revisiting the Polyol Synthesis and Plasmonic Properties of Silver Nanocubes

2020 ◽  
Vol 1 (1) ◽  
pp. 132-140
Author(s):  
Hongyue Wang ◽  
Yangyang Guo ◽  
Miao Zhang ◽  
Huixin Li ◽  
Yang Wei ◽  
...  
Keyword(s):  
Edge Length ◽  
Injection Rate ◽  
Polyol Process ◽  
Growth Time ◽  
Plasmonic Effect ◽  
Temperature Growth ◽  
Metal Nanocrystals ◽  
Silver Nanocubes ◽  
Ag Nanowires ◽  
Time Injection

Background: Noble-metal nanocrystals have been extensively studied over the past decades because of their unique optical properties. The polyol process is considered an effective method for silver (Ag) nanocrystals’ synthesis in solution even though the reproducibility of its shape controlling is still a challenge. Here, Ag nanowires and nanocubes were synthesized by the polyol process, in which the Ag+ ions are directly reduced by ethylene glycol with a certain amount of Cl− ions added. We present the relationship between the final morphology of the Ag nanostructures with the parameters of reaction, including temperature, growth time, injection rate, and the amount of sodium chloride. The as-synthesized nanowires and nanocubes were characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The uniformly distributed nanocubes with a mean edge length of 140 nm were obtained. The localized surface plasmon resonance of Ag nanocubes was characterized by laser scanning fluorescence confocal microscopy. The photoluminescence enhancement was observed on the perovskite film coupled with Ag nanocubes. Objective: We aimed to synthesize uniform and controllable silver nanocubes and nanowires through the polyol process and explore the interaction between CsPbBr3 perovskite film and Ag nanocubes antennas. Methods: We synthesized silver nanocubes and nanowires through the polyol process where the silver nitrate (AgNO3) was reduced by Ethylene Glycol (EG) in the presence of a blocking agent polyvinylpyrrolidone (PVP). Results: We successfully synthesized Ag nanocubes with an average edge length of 140 nm and Ag nanowires with a uniform distribution in terms of both shape and size through a polyol process with sodium chloride (NaCl) as the additive. In addition, the local photoluminescence (PL) enhancement was observed in a perovskite film by combining Ag nanocubes, which is attributed to the antennas plasmonic effect of the Ag nanocubes. Conclusion: In summary we studied the parameters in the polyol process such as reaction temperature, growth time, injection rate, kind of halide ion and NaCl amount for the synthesis of Ag nanowires and nanocubes. Our results suggest that the concentration of Cl- and the growth time have the main influence on Ag nanowires and nanocubes formation. The optimum growth time was found to be 60 min and 120 min for the formation of Ag nanowires and nanocubes, respectively. In addition, we revealed that the opportune reaction temperature of Ag nanowires was 140 °C. The injection rate of precursors was also found to play an important role in the final morphology of Ag nanowires and nanocubes. In addition, for the generation of Ag nanocubes, the presence of Cl− ion in the reaction is critical, which can eliminate most of the byproducts. We obtained the Ag nanowires with a uniform distribution in terms of both shape and size, and nanocubes with average lengths of 140 nm by the polyol process with the optimal parameters. Plasmon-coupled emission induced by noble-metal nanocrystals has attracted more attention in recent years. In this work, the PL of a perovskite film was enhanced by the coupling of Ag nanocubes due to the surface plasmonic effect.

scholarly journals Growth of AlN crystals on AlN/SiC seeds by AlN powder sublimation in nitrogen atmosphere

2004 ◽  
Vol 9 ◽  
Author(s):  
V. Noveski ◽  
R. Schlesser ◽  
S. Mahajan ◽  
S. Beaudoin ◽  
Z. Sitar
Keyword(s):  
Chemical Vapor ◽  
Nitrogen Atmosphere ◽  
Growth Time ◽  
X Ray Diffraction ◽  
Temperature Growth ◽  
Step Flow ◽  
Surface Areas ◽  
Diffusion Controlled ◽  
Initial Nucleation ◽  
Step Flow Growth

AlN single crystals were grown on AlN/SiC seeds by sublimation of AlN powder in TaC crucibles in a nitrogen atmosphere. The seeds were produced by metallorganic chemical vapor deposition (MOCVD) of AlN on SiC crystals. The influence of growth temperature, growth time and source-to-seed distance on the crystallinity and the crystal growth rate were investigated. Crystals were grown in an RF heated sublimation reactor at growth temperatures ranging from 1800-2000°C, at a pressure of 600 Torr, nitrogen flow-rate of 100 sccm and source-to-seed distances of 10 and 35 mm. At 1870°C and a source-to-seed distance of 35 mm, isolated crystals were observed with few instances of coalescence. At 1930°C, a source-to-seed distance of 10 mm and longer growth times (~30 hrs), crystal coalescence was achieved. Above 1930°C, the decomposition of SiC was evidently affecting the growth morphology and resulted in growth of polycrystalline AlN. After an initial nucleation period, the observed growth rates (10-30 µm/hr) were in close agreement with predictions of a growth model that assumed gas-phase diffusion controlled growth. Optical and electron microscope observations revealed step-flow growth, while X-ray diffraction results showed the single crystal nature of the grown material. Single crystalline AlN was grown over surface areas of 200-300 mm2 and was transparent and essentially colorless.

Growth Mechanism of Penta-twinned Ag Nanowires Synthesized by Polyol Process

2008 ◽  
Vol 24 (05) ◽  
pp. 781-787
Author(s):  
FU Xiao-Feng ◽  
◽  
◽  
ZOU Hua-Min ◽  
ZHOU Li ◽  
...  
Keyword(s):  
Growth Mechanism ◽  
Polyol Process ◽  
Ag Nanowires

scholarly journals High-Yield Synthesis of Uniform Ag Nanowires with High Aspect Ratios by Introducing the Long-Chain PVP in an Improved Polyol Process

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Jie-Jun Zhu ◽  
Cai-Xia Kan ◽  
Jian-Guo Wan ◽  
Min Han ◽  
Guang-Hou Wang
Keyword(s):  
Silver Nanowires ◽  
Polyol Process ◽  
High Yield ◽  
Chemical Adsorption ◽  
Capping Agent ◽  
Molecular Weights ◽  
Aspect Ratios ◽  
Initial Stage ◽  
Ag Nanowires ◽  
Long Chain

Polyvinyl pyrrolidone (PVP) with different molecular weights was used as capping agent to synthesize silver nanowires through a polyol process. The results indicated that the yields and aspect ratios of silver nanowires were controlled by the chain length of PVP and increased with increasing the molecular weight (MW) of PVP. When the long-chain PVP-K90 (MW = 800,000) was used, the product was uniform in size and was dominated by nanowires with high aspect ratios. The growth mechanism of the nanowires was studied. It is proposed that the chemical adsorption of Ag+on the PVP chains at the initial stage promotes the growth of Ag nanowires.

Influence of Parametric Variations on Hydrothermal Growth of ZnO Nanostructures for Hybrid Polymer/ZnO Based Photodetector

2016 ◽  
Vol 16 (4) ◽  
pp. 3254-3261 ◽  
Author(s):  
Tejendra Dixit ◽  
Anubha Bilgaiyan ◽  
I. A Palani ◽  
Vipul Singh
Keyword(s):  
Electronic Devices ◽  
Hydrothermal Process ◽  
Solution Concentration ◽  
Edge Length ◽  
Hexagonal Structure ◽  
Effect Of Temperature ◽  
Growth Time ◽  
Zno Nanostructures ◽  
Temperature Solution ◽  
Direct Band

Dumbbell and flower like ZnO nano-crystals were grown via hydrothermal process. The as-prepared dumbbells, with length of 0.8–10 μm and edge length of 0.3–0.8 μm possess a hexagonal structure, while flowers with lengths ranging from 1–6 μm with hexagonal structure have been synthesized. The effect of temperature, solution concentration and growth time on the size and shapes of the ZnO nanostructures has been studied using Field emission scanning electron microscope (FESEM) and X-ray diffractometer (XRD). Further the optical properties of nanostructures were investigated by Photoluminescence (PL) spectroscopy, which shows emission in UV and visible regions. From Diffused reflectance spectroscopic analysis (DRA) it was observed that ZnO nanodumbbells and nanoflowers have a direct band gap of 3.27 eV and 3.25 eV respectively. The I–V plot showed dependence of current values under dark and illumination over the annealing temperature during the growth stage. Thus we report a control over the shape and dimension of nanostructures by varying various parameters having implications for (opto)electronic devices.

Synthesis of perfect silver nanocubes by a simple polyol process

2007 ◽  
Vol 22 (6) ◽  
pp. 1479-1485 ◽  
Author(s):  
Jiejun Zhu ◽  
Caixia Kan ◽  
Xiaoguang Zhu ◽  
Jian-guo Wan ◽  
Min Han ◽  
...  
Keyword(s):  
Optical Properties ◽  
Growth Mechanism ◽  
Edge Length ◽  
Vinyl Pyrrolidone ◽  
Polyol Synthesis ◽  
Synthesis Process ◽  
Silver Nanocubes ◽  
Sharp Edges ◽  
Average Edge Length ◽  
Poly Vinyl Pyrrolidone

In this work, we report on silver nanocubes with perfect shape prepared by a simple poly(vinyl pyrrolidone)-directed polyol synthesis process. The effects of poly(vinyl pyrrolidone)/AgNO3ratio Rand reaction temperature Ton the morphology and size of the products were investigated. Ag nanocubes with an average edge length of 230 nm were obtained successfully with sharp edges and corners under a precise synthesis condition of R= 1 and T= 150 °C. The optical properties of Ag nanocubes show an attractive plasma resonance red-shift with size in a wide spectra region. The growth mechanism of the Ag nanocubes is proposed to be thermodynamically and kinetically controlled.

Study and Preparation of Pure-Phase Cu2ZnSnS4 Nanocrystals by Solvothermal Method

2012 ◽  
Vol 271-272 ◽  
pp. 8-11
Author(s):  
Jie Li ◽  
Wei Guang Yang ◽  
Wei Min Shi ◽  
Ji Rong Li ◽  
Lin Jun Wang
Keyword(s):  
Reaction Temperature ◽  
Mixed Solvent ◽  
Solvothermal Method ◽  
Important Influence ◽  
Synthesis Process ◽  
Growth Time ◽  
High Quality ◽  
Temperature Growth ◽  
Pure Phase

The as-prepared high-quality Cu2ZnSnS4 nanocrystals were prepared by solvothermal method. The influence of the reaction temperature, growth time and mixed solvent on the structural and composition of the Cu2ZnSnS4 nanocrystals was investigated. XRD result shows the percentage of ethylenediamine in the mixed solvent have an important influence in the synthesis process of pure-phase Cu2ZnSnS4 nanocrystals. EDS result proves the particles belong to Cu rich and Zn poor composition.

Epitaxial Growth of Heterogeneous Metal Nanocrystals: From Gold Nano-octahedra to Palladium and Silver Nanocubes

2008 ◽  
Vol 130 (22) ◽  
pp. 6949-6951 ◽  
Author(s):  
Feng-Ru Fan ◽  
De-Yu Liu ◽  
Yuan-Fei Wu ◽  
Sai Duan ◽  
Zhao-Xiong Xie ◽  
...  
Keyword(s):  
Epitaxial Growth ◽  
Metal Nanocrystals ◽  
Silver Nanocubes

Comparative Raman and HRTEM Study of Nanostructured GaN Nucleation Layers and Device Layers on Sapphire (0001)

2008 ◽  
Vol 8 (11) ◽  
pp. 5985-5992
Author(s):  
P. Pant ◽  
J. Narayan ◽  
A. Wushuer ◽  
M. H. Manghnani
Keyword(s):  
Thermal Expansion ◽  
High Temperature ◽  
Compressive Stress ◽  
Hexagonal Phase ◽  
Stacking Faults ◽  
Growth Time ◽  
Cubic Phase ◽  
Device Layer ◽  
Temperature Growth ◽  
Gan Film

Raman spectroscopy in conjunction with high-resolution transmission electron microscopy (HRTEM) has been used to study structural characteristics and strain distribution of the nanostructured GaN nucleation layer (NL) and the GaN device layer on (0001) sapphire substrates used for light-emitting diodes and lasers. Raman peaks corresponding to the cubic and the hexagonal phase of GaN are observed in the Raman spectrum from 15 nm and 45 nm NLs. A comparison of the peak intensities for the cubic and hexagonal phases of GaN in the NLs suggests that the cubic phase is dominant in the 15 nm NL and the hexagonal phase in the 45 nm NL. An increase in the density of stacking faults in the metastable cubic GaN (c-GaN) phase with increasing growth time lowers the system energy as well as locally converts c-GaN phase into hexagonal GaN (h-GaN). It also explains the observation of the more intense peaks of h-GaN in the 45 nm NL compared to c-GaN peaks. For the sample wherein an h-GaN device layer was grown at higher temperatures on the NL, narrow Raman peaks corresponding to only h-GaN were observed, confirming the high-quality of the films. The peak shift of the E2H(LO) mode of h-GaN in the NLs and the h-GaN film suggests the presence of a tensile stress in the NL which is attributed to defects such as stacking faults and twins, and a compressive stress in high-temperature grown h-GaN film which is attributed to the thermal-expansion mismatch between the film and the substrate. The peak shifts of the substrate also reveal that during the low temperature growth of the NL the substrate is under a compressive stress which is attributed to defects in the NL and during the high temperature growth of the device layer, there is a tensile strain in the substrate as expected from differences in coefficients of thermal expansion of the film and the substrate during the cooling cycle.

The Role of Oxygen in Synthesizing Monodisperse Silver Nanocubes

2011 ◽  
Vol 64 (11) ◽  
pp. 1488 ◽  
Author(s):  
Bakul Gupta ◽  
Will Rouesnel ◽  
J. Justin Gooding
Keyword(s):  
Oxygen Concentration ◽  
Edge Length ◽  
Chloride Ions ◽  
Polyol Synthesis ◽  
X Ray Diffraction ◽  
Silver Nanocubes ◽  
Headspace Oxygen ◽  
Oxidative Etching ◽  
Lower Oxygen ◽  
High Concentrations

In this work, we report on silver nanocubes prepared by using the conventional polyol synthesis in the presence of hydrochloric acid and oxygen. We found that by controlling the headspace oxygen concentration in the sample vial at a temperature of 140°C, monodisperse silver nanocubes of 100–115 nm in edge length were produced. A specific headspace oxygen concentration along with the chloride ions promoted the oxidative etching of twinned particles so that only single crystal cubes were produced. At lower oxygen concentrations, nanorods and wires were obtained whereas at very high concentrations all the particles were completely etched away resulting in a solution with no nanoparticles. Electron diffraction and X-ray diffraction analysis was employed to study the structural characterization. Scanning electron microscopy was used to examine the morphology of the silver nanoparticles.

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