One-Step Synthesis of Stable Gold Nanoparticles on Eco-friendly Ionic Liquid

2012 ◽  
Vol 1386 ◽  
Author(s):  
P Anantha ◽  
Xiu Wang ◽  
C.C. Wong
Keyword(s):  
Gold Nanoparticles ◽  
Ionic Liquid ◽  
Metallic Nanoparticles ◽  
Thermal Evaporation ◽  
Processing Technique ◽  
Nanoparticle Dispersion ◽  
Thermal Evaporation Method ◽  
Stabilizing Agents ◽  
Transmission Electron ◽  
The Difference

ABSTRACTMetallic nanoparticles are often obtained by chemical decomposition or reactive techniques involving the extensive usage of harmful reducing or stabilizing agents. A facile green synthesis technique resulting in readily exploitable nanoparticle dispersion in ionic liquid without the use of any additional agents is reported here. 1-Propyl- 3- Methyl Imidazolium Iodide (PMIM(I)) is a non-volatile, thermally stable and non-toxic ionic liquid. This eco-friendly liquid is used as the substrate for thermal evaporation of gold to obtain stable gold nanoparticles. On being examined by Transmission Electron Microscopy the high monodispersity in their sizes was revealed. The byproduct free, ‘clean’ processing technique helps in obtaining un-contaminated particles. The thermal evaporation method used (for the generation of metallic vapor) plays a significant role in the difference in kinetics of the formation and growth of nanoparticles, unlike the widely reported sputtering technique for vapor generation. The formed particles are deposited only on the top surface of the liquid. Thus the nucleation and growth of the particles can be considered to have occurred by surface diffusion process only. A deeper investigation into the formation kinetics has the potential application for synthesizing other nanomaterials via this environmental friendly approach.

scholarly journals Biosynthesis and Potential Applications of Silver and Gold Nanoparticles and Their Chitosan-Based Nanocomposites in Nanomedicine

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Haliza Katas ◽  
Noor Zianah Moden ◽  
Chei Sin Lim ◽  
Terence Celesistinus ◽  
Jie Yee Chan ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Metallic Nanoparticles ◽  
Cost Effective ◽  
One Pot ◽  
Silver And Gold Nanoparticles ◽  
Stabilizing Agents ◽  
Cost Effective Method ◽  
Multistep Process ◽  
Potential Applications ◽  
Biological Sources

Biosynthesized or biogenic metallic nanoparticles, particularly silver and gold nanoparticles (AgNPs and AuNPs, respectively), have been increasingly used because of their advantages, including high stability and loading capacity; moreover, these nanoparticles are synthesized using a green and cost-effective method. Previous studies have investigated reducing and/or stabilizing agents from various biological sources, including plants, microorganisms, and marine-derived products, using either a one-pot or a multistep process at different conditions. In addition, extensive studies have been performed to determine the biological or pharmacological effects of these nanoparticles, such as antimicrobial, antitumor, anti-inflammatory, and antioxidant effects. In the recent years, chitosan, a natural cationic polysaccharide, has been increasingly investigated as a reducing and/or stabilizing agent in the synthesis of biogenic metallic nanoparticles with potential applications in nanomedicine. Here, we have reviewed the mechanism of biosynthesis and potential applications of AgNPs and AuNPs and their chitosan-mediated nanocomposites in nanomedicine.

scholarly journals Protein-Coated Aryl Modified Gold Nanoparticles for Cellular Uptake Study by Osteosarcoma Cancer Cells

2020 ◽  
Author(s):  
Mehvesh Hameed ◽  
Seema Panicker ◽  
Sallam Hasan Abdallah ◽  
Amir A. Khan ◽  
Changseok Han ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Cancer Cells ◽  
Cellular Uptake ◽  
Phase Transfer ◽  
Chemical Reduction ◽  
Uptake Study ◽  
Stabilizing Agents ◽  
Coated Nanoparticles ◽  
Green Route ◽  
The Difference

We synthesized protein-coated gold nanoparticles using green and chemical reduction routes for cellular uptake study. In the current work, we coated gold-aryl nanoparticles of the type AuNPs-C<sub>6</sub>H<sub>4</sub>-4-COOH with BSA, collagen, zein and lysozyme proteins. Both routes were carried out without phase-transfer catalysts or extraneous stabilizing agents. High crystallinity of the AuNPs synthesized by the green route can be seen in the transmission electron microscopy images. <a>Osteosarcoma cancer cells are malignant bone tumors with abnormal cellular functions. Studies using MG-63 cells will provide mechanistic suggestions on the details of the amplification in tumors. </a>We studied the cellular uptake of the bioconjugates by MG-63 osteosarcoma cells using laser confocal fluorescence microscopy (LCFM) and flow cytometry. In the LCFM study, BSA-AuNPs was uptaken most efficiently of all protein-coated gold nanoparticles synthesized by the green route. Zein and lysozyme coated nanoparticles, though small sizes, prepared by the green method were not efficiently uptaken by MG-63. The two nanoparticles are negatively charged and zein is also a hydrophobic coat. The difference in hydrophobicity and charge might have affected the internalization. All of those coated nanoparticles that were efficiently uptaken can potentially be used as diagnostic and therapeutic agents for osteosarcoma.

PREPARATION, CHARACTERIZATION AND LUMINESCENCE PROPERTIES OF Eu DOPED CaAl2O4 NANOCONES

2013 ◽  
Vol 27 (19) ◽  
pp. 1341018 ◽  
Author(s):  
J. M. LIANG ◽  
L. L. HE ◽  
Z. Q. SHEN ◽  
D. L. ZHANG
Keyword(s):  
Electron Microscope ◽  
Room Temperature ◽  
Thermal Evaporation ◽  
The Body ◽  
Monoclinic Structure ◽  
Thermal Evaporation Method ◽  
Room Temperature Photoluminescence ◽  
Spectrum Measurement ◽  
Transmission Electron ◽  
First Time

Europium doped CaAl 2 O 4 nanocones have been grown first time by thermal evaporation method. Scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to analyze the morphology, size and crystal structure of the nanocones. The body of the nanocones are about 2–20 μm in length and their diameters are 200 nm to 1 μm at one end and tapers off to a ~ 40–200 nm at the tip end. The as-synthesized nanocones are single crystalline in monoclinic structure and grow along the [010] direction and the normal direction of (100) and (001). The room temperature photoluminescence (PL) and cathodoluminescence (CL) spectrum measurement reveals that CaAl 2 O 4: Eu 2+ nanocones emit light at about 440 nm.

scholarly journals Versatile Phase Transfer Method for the Efficient Surface Functionalization of Gold Nanoparticles: Towards Controlled Nanoparticle Dispersion in a Polymer Matrix

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Katarzyna Ranoszek-Soliwoda ◽  
Maria Girleanu ◽  
Beata Tkacz-Szczęsna ◽  
Marcin Rosowski ◽  
Grzegorz Celichowski ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Polymer Matrix ◽  
Surface Functionalization ◽  
Transfer Process ◽  
Metallic Nanoparticles ◽  
Phase Transfer ◽  
Electron Tomography ◽  
Homogeneous Layer ◽  
Nanoparticle Dispersion ◽  
Vis Spectroscopy

In electronic devices based on hybrid materials such as nonvolatile memory elements (NVMEs), it is essential to control precisely the dispersion of metallic nanoparticles (NPs) in an insulating polymer matrix such as polystyrene in order to control the functionality of the device. In this work the incorporation of AuNPs in polystyrene films is controlled by tuning the surface functionalization of the metallic nanoparticles via ligand exchange. Two ligands with different structures were used for functionalization: 1-decanethiol and thiol-terminated polystyrene. This paper presents a versatile method for the modification of gold nanoparticles (AuNPs) with thiol-terminated polystyrene ligands via phase transfer process. An organic colloid of AuNPs (5±1 nm diameter) is obtained by the phase transfer process (from water to toluene) that allows exchanging the ligand adsorbed on AuNPs surface (hydrophilic citrate/tannic acid to hydrophobic thiols). The stability, size distribution, and precise location of modified AuNPs in the polymer matrix are obtained from UV-Vis spectroscopy, dynamic light scattering (DLS), and electron tomography. TEM tomographic 3D imaging demonstrates that the modification of AuNPs with thiol-terminated polystyrene results in homogeneous particle distribution in the polystyrene matrix compared to 1-decanethiol modified AuNPs for which a vertical phase separation with a homogeneous layer of AuNPs located at the bottom of the polymer matrix was observed.

Green Synthesis of Gold Nanoparticles Using Longan Polysaccharide and their Reduction of 4-nitrophenol and Biological Applications

NANO ◽  
2020 ◽  
Vol 15 (01) ◽  
pp. 2050002 ◽  
Author(s):  
Xiaoyu Zhang ◽  
Liyuan Fan ◽  
Yanshuai Cui ◽  
Tianming Cui ◽  
Shengfu Chen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Metallic Nanoparticles ◽  
High Catalytic Activity ◽  
Synthetic Method ◽  
Biological Applications ◽  
Au Nps ◽  
Stabilizing Agents ◽  
Highly Dispersed ◽  
Negative Zeta Potential

The green synthesis of gold nanoparticles (Au NPs) for catalytic and biological applications has been drawing great attention. To compare with plant extracts, the polysaccharides may be good reducing and stabilizing agents. In this work, we describe the preparation of longan polysaccharide stabilized gold nanoparticles (Aun-LP NPs) by reduction of gold ions using a green synthetic method. The formation of gold nanoparticles (Au NPs) was confirmed by UV-Vis spectra. TEM showed that Au NPs had a small size (7.8–15.6[Formula: see text]nm) and were highly dispersed without any aggregation. XPS confirmed that the surface elemental composition of Aun-LP NPs was C, O, and Au. DLS demonstrated that Aun-LP NPs had good stability and negative zeta potential. In addition, Aun-LP NPs had high catalytic activity for the reduction of 4-nitrophenol. More importantly, Aun-LP NPs had ignorable cytotoxicity towards HeLa cells and showed good antioxidant activity. Taken together, the results indicated that longan polysaccharide can be used as reducing agents and stabilizers for the preparation of metallic nanoparticles, and the product had wide applications.

scholarly journals Green Synthesis of Gold Nanoparticles Using Polianthes tuberosa L. Floral Extract

Plants ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2370
Author(s):  
Mousa A. Alghuthaymi ◽  
Chandrasekaran Rajkuberan ◽  
Thiyagaraj Santhiya ◽  
Ondrej Krejcar ◽  
Kamil Kuča ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Metallic Nanoparticles ◽  
Antagonistic Activity ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Potential Applications ◽  
Uv Visible ◽  
Dose Dependent ◽  
Mcf 7

The developments of green-based metallic nanoparticles (gold) are gaining tremendous interest, having potential applications in health care and diagnosis. Therefore, in the present study, Polianthes tuberosa flower filtered extract was used as a reducing and stabilizing agent to synthesize gold nanoparticles (PtubAuNPs). The PtubAuNPs were extensively characterized by UV–visible spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy, and X-ray diffraction. The antibacterial activity of PtubAuNPs was determined by the agar well diffusion method; the PtubAuNPs performed extreme antagonistic activity against the tested pathogens. Furthermore, the cytotoxicity of the PtubAuNPs was evaluated in MCF 7 cells by MTT assay. The PtubAuNPs induced toxicity in MCF 7 cells with the least concentration of 100 µg/mL in a dose-dependent method by inducing apoptosis. Overall, the study manifested that PtubAuNPs are a potent nanomaterial that can be employed as an antimicrobial and anticancer agent.

Heteroe-Pitaxial Growth and Optical Properties of SnO2 Nanowires on ZnS Nanobelts

2012 ◽  
Vol 535-537 ◽  
pp. 481-485 ◽  
Author(s):  
Mang Jiang ◽  
Jun Hong Duan ◽  
Zhiang Liu
Keyword(s):  
Electron Microscopy ◽  
Optical Properties ◽  
Room Temperature ◽  
Thermal Evaporation ◽  
Structural Information ◽  
X Ray Diffraction ◽  
Thermal Evaporation Method ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

The authors present the results of hetero-epitaxial growth of ultrafine SnO2nanowires on ZnS nanobelt substrates by a simple thermal evaporation method. ZnS/SnO2hetero-nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDS), transmission electron microscopy (TEM) to obtain the morphology and structural information. Comparing with ZnS nanobelts and SnO2nanowires respectively, the optical properties of ZnS/SnO2hetero-nanostructures are studied by Raman scattering and photoluminescence (PL) spectroscopy at room temperature.

Gan Nanowire Growth by Thermal Evaporation Method

2012 ◽  
Vol 501 ◽  
pp. 276-280
Author(s):  
Leila Shekari ◽  
Abu Hassan Haslan ◽  
Hassan Zainuriah
Keyword(s):  
Gas Flow ◽  
Thermal Evaporation ◽  
Mixed Gas ◽  
Thermal Evaporation Method ◽  
X Ray ◽  
Transmission Electron ◽  
Gas Atmosphere ◽  
Ar Gas ◽  
Uniform Diameter ◽  
Different Diameters

In this research we introduce an inexpensive method to produce highly crystalline GaN Nanowires (NWs) grown on porous zinc oxide (PZnO) using commercial GaN powder, either in argon gas or combination of nitrogen and Ar gas atmosphere, by thermal evaporation. Morphological structural studies using transmission electron microscope (TEM) and scanning electron microscopy (SEM) measurements showed the role of porosity and different gas flowing, in the alignment and nucleation of these NWs. The NWs grown under flow of mix gases have very different diameters of between 50 and 200 nm, but those which were grown in Ar gas atmosphere, have rather uniform diameter of around 50 nm. The length of the GaN NWs was uniform, (around 10 µm). Optical and structural characterizations were performed by energy-dispersive X-ray spectroscopy (EDX) and high resolution X-ray diffraction (HR-XRD). Results revealed that these NWs are of single-crystal hexagonal GaN with [oooı] and [ıoīı] growth directions for the NWs grown under Ar and mixed gas flow.

ZnS nanowires growth on two different types of substrate using simple thermal evaporation method

2020 ◽  
Vol 34 (26) ◽  
pp. 2050231
Author(s):  
B. Abadllah ◽  
M. Kakhia ◽  
A. Obaide ◽  
W. Zetoun
Keyword(s):  
Electron Microscopy ◽  
Thermal Evaporation ◽  
Sem Images ◽  
Thermal Evaporation Method ◽  
X Ray ◽  
Evaporation Method ◽  
Main Compound ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Transmission Electron

ZnS nanowires films were grown on two different substrates silicon and glass, with PbS dopant at 5 wt.%, using thermal evaporation method. The silicon is single crystal (only Si), while the glass is as amorphous substrate (mainly SiO2). In the used substrates, the morphology was confirmed by Atomic Force Microscopy (AFM) as well as Scanning Electron Microscopy (SEM) images (cross-section and surface). High Resolution Transmission Electron Microscopy (HRTEM) has been used to confirm the ZnO nanowires for doped films (PbS:ZnS) in both silicon and glass substrates, with diameter less than 50 nm and the thickness was varied from 2000 nm to 3000 nm. The undoped film has dense structure and is thin with thickness of 200 nm. The growth of nanowires is not affected by the two substrate types (silicon and glass). The compositions of chemical films have been verified by energy dispersive X-ray spectroscopy (EDX), and it confirms that ZnS is the main compound. X-ray Diffraction (XRD) investigated the crystallographic properties with wurtzite structure. Optical properties (transparency and bandgap) were deduced from UltraViolet Visible (UV-Vis) spectra of ZnS films (PbS 0 and 5 wt.%) deposited on glass substrate. Raman, Photoluminescence (PL) and Fourier transform infrared (FTIR) techniques confirm ZnS composition and its nonstructural growth. Finally, a good agreement between the XRD, FTIR and HRTEM analyses was found.

Synthesis of Chainlike In2Ge2O7/Amorphous GeO2 Core/Shell Nanocables and Their Luminescence

2007 ◽  
Vol 7 (12) ◽  
pp. 4365-4368 ◽  
Author(s):  
Yong Su ◽  
Xia Meng ◽  
Sen Li ◽  
Yiqing Chen ◽  
Liang Xu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Growth Process ◽  
Room Temperature ◽  
Thermal Evaporation ◽  
Core Shell ◽  
Thermal Evaporation Method ◽  
X Ray ◽  
Room Temperature Photoluminescence ◽  
Transmission Electron ◽  
Spectroscopy Studies

Novel chainlike In2Ge2O7/amorphous GeO2 core/shell nanocables were successfully synthesized by the simple thermal evaporation method without the presence of catalyst. The growth process of the nanocables is based on vapor–solid (VS) growth mechanism. Its morphology and microstructures were characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and photoluminescence spectroscopy. Studies indicate that typical chainlike nanocables consist of single crystalline In2Ge2O7 nanowires (core) with diameter of about 30 nm and amorphous GeO2 chainlike nanostructures (shell). Four emission peaks, namely 401 nm, 448.5 nm, 466.5 nm, and 491 nm, were observed in the room-temperature photoluminescence measurements.

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