Recent advances (2016 - 2020) in green synthesis of metal oxide nanoparticles: An overview

2021 ◽  
Vol 10 (16) ◽  
pp. e399101623406
Author(s):  
Marta Bianca da Costa Rocha ◽  
Tomaz Rodrigues de Araújo ◽  
Rodolfo Luiz Bezerra de Araújo Medeiros ◽  
Marcelo Moizinho Oliveira ◽  
Gilvan Pereira de Figueredo
Keyword(s):  
Green Synthesis ◽  
Essential Role ◽  
Low Cost ◽  
Metal Oxide Nanoparticles ◽  
Raw Material ◽  
Synthesis Process ◽  
Oxide Nanoparticles ◽  
Great Availability ◽  
Biological Sources ◽  
Interest In Research

The development of products and processes which are more ecological has been a source of interest in research in recent decades. Thus, researchers have developed several methods to improve the synthesis of oxides and metals in a more ecological way. Green synthesis has become a method that is being widely used for presenting low temperature, low cost and great availability of raw material. Some biological sources such as fungi, bacteria and plants are used in this route, but plant extracts are the most used in the literature. Various parts of the plant such as the roots, bark, flowers, fruits, stem, seeds, and leaves are rich in secondary metabolites such as: flavonoids, phenols, steroids, terpenoids, alkaloids, saponins and phenolic compounds, which play an essential role in the complexation, polymerization, capping and stabilization processes that generate oxides. The methodology used in the synthesis process significantly interferes in some properties and characteristics of the same oxide as its morphology. In this sense, this paper presents a review on green synthesis in obtaining oxides and their morphologies.

Green Route for the Fabrication of ZnO Nanoparticles and Potential Functionalization with Chitosan Using Cross-linkers: A Review

2021 ◽  
Vol 3 (1) ◽  
pp. 1-25
Author(s):  
Hemra Hamrayev ◽  
Kamyar Shameli ◽  
Mostafa Yusefi ◽  
Serdar Korpayev
Keyword(s):  
Zinc Oxide ◽  
Metal Oxide ◽  
Green Synthesis ◽  
Zno Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Synthesis Methods ◽  
Zno Nps ◽  
Biological Sources ◽  
Physical And Chemical

Zinc oxide is of significant importance for many industries due to its versatile properties, which have been enhanced with the production of this material in the nanoscale. Recent interest in the preparation of metal oxide nanoparticles using biological approaches has been reported in the literature. This technique known as “green synthesis” is an environmentally benign process than conventional methods like physical and chemical synthesis methods. Zinc oxide nanoparticles (ZnO-NPs) have been successfully obtained by green synthesis using different biological substrates like chitosan. Chitosan is biocompatible, biodegradable polymer having exclusive physical and chemical properties. Chitosan/metal oxide nanocomposite is a promising nanomaterial with enhanced properties for multiple functionalities. Therefore, this review discusses favorable approach in the formation of cross-linked Chitosan/ZnO nanocomposites attracting significant attention in various fields such biomedical due to their unique biodegradable, biocompatible, non-toxic nature. The use of biological sources, fabrication of green synthesized ZnO nanoparticles and its applications is briefly discussed. Overall, this review is a comprehensive study for the synthesis of ZnO-NPs using biological sources counting on their features and applications.

scholarly journals Plant-Based Biosynthesis of Copper/Copper Oxide Nanoparticles: An Update on Their Applications in Biomedicine, Mechanisms, and Toxicity

Biomolecules ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 564
Author(s):  
Devanthiran Letchumanan ◽  
Sophia P. M. Sok ◽  
Suriani Ibrahim ◽  
Noor Hasima Nagoor ◽  
Norhafiza Mohd Arshad
Keyword(s):  
Copper Oxide ◽  
Low Cost ◽  
Metal Oxide Nanoparticles ◽  
Cost Effective ◽  
Copper Oxide Nanoparticles ◽  
Synthesis Process ◽  
Oxide Nanoparticles ◽  
Cuo Nps ◽  
Metal Metal ◽  
Reducing Properties

Plants are rich in phytoconstituent biomolecules that served as a good source of medicine. More recently, they have been employed in synthesizing metal/metal oxide nanoparticles (NPs) due to their capping and reducing properties. This green synthesis approach is environmentally friendly and allows the production of the desired NPs in different sizes and shapes by manipulating parameters during the synthesis process. The most commonly used metals and oxides are gold (Au), silver (Ag), and copper (Cu). Among these, Cu is a relatively low-cost metal that is more cost-effective than Au and Ag. In this review, we present an overview and current update of plant-mediated Cu/copper oxide (CuO) NPs, including their synthesis, medicinal applications, and mechanisms. Furthermore, the toxic effects of these NPs and their efficacy compared to commercial NPs are reviewed. This review provides an insight into the potential of developing plant-based Cu/CuO NPs as a therapeutic agent for various diseases in the future.

Star fruit extract-mediated green synthesis of metal oxide nanoparticles

2021 ◽  
pp. 1-8
Author(s):  
Sagadevan Suresh ◽  
Selvaraj Vennila ◽  
J. Anita Lett ◽  
Is Fatimah ◽  
Faruq Mohammad ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Green Synthesis ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Fruit Extract ◽  
Star Fruit

scholarly journals Flower-Based Green Synthesis of Metallic Nanoparticles: Applications beyond Fragrance

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 766 ◽  
Author(s):  
Harsh Kumar ◽  
Kanchan Bhardwaj ◽  
Kamil Kuča ◽  
Anu Kalia ◽  
Eugenie Nepovimova ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Metal Oxide ◽  
Green Synthesis ◽  
Metallic Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Secondary Compounds ◽  
Oxide Nanoparticles ◽  
Gold And Silver Nanoparticles ◽  
Gold Silver ◽  
Metal Metal

Green synthesis has gained wide attention as a sustainable, reliable, and eco-friendly approach to the synthesis of a variety of nanomaterials, including hybrid materials, metal/metal oxide nanoparticles, and bioinspired materials. Plant flowers contain diverse secondary compounds, including pigments, volatile substances contributing to fragrance, and other phenolics that have a profound ethnobotanical relevance, particularly in relation to the curing of diseases by ‘Pushpa Ayurveda’ or floral therapy. These compounds can be utilized as potent reducing agents for the synthesis of a variety of metal/metal oxide nanoparticles (NPs), such as gold, silver, copper, zinc, iron, and cadmium. Phytochemicals from flowers can act both as reducing and stabilizing agents, besides having a role as precursor molecules for the formation of NPs. Furthermore, the synthesis is mostly performed at ambient room temperatures and is eco-friendly, as no toxic derivatives are formed. The NPs obtained exhibit unique and diverse properties, which can be harnessed for a variety of applications in different fields. This review reports the use of a variety of flower extracts for the green synthesis of several types of metallic nanoparticles and their applications. This review shows that flower extract was mainly used to design gold and silver nanoparticles, while other metals and metal oxides were less explored in relation to this synthesis. Flower-derived silver nanoparticles show good antibacterial, antioxidant, and insecticidal activities and can be used in different applications.

Bio-green synthesis of Ni-doped tin oxide nanoparticles and its influence on gas sensing properties

RSC Advances ◽  
2015 ◽  
Vol 5 (89) ◽  
pp. 72849-72856 ◽  
Author(s):  
Ketan P. Gattu ◽  
Kalyani Ghule ◽  
Anil A. Kashale ◽  
V. B. Patil ◽  
D. M. Phase ◽  
...  
Keyword(s):  
Green Synthesis ◽  
Tin Oxide ◽  
Gas Sensing ◽  
Low Cost ◽  
Environmentally Friendly ◽  
Cost Effective ◽  
Oxide Nanoparticles ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Tin Oxide Nanoparticles

Using a novel, cost-effective and environmentally friendly biosynthesis method, Ni-doped SnO2 nanoparticles have been synthesized. Gas sensing results suggest that the Ni-dopant is a promising additive to fabricate low cost SnO2 based sensors.

scholarly journals Green Synthesis of Metal and Metal Oxide Nanoparticles and Their Effect on the Unicellular Alga Chlamydomonas reinhardtii

2018 ◽  
Vol 13 (1) ◽  
Author(s):  
Nhung H. A. Nguyen ◽  
Vinod Vellora Thekkae Padil ◽  
Vera I. Slaveykova ◽  
Miroslav Černík ◽  
Alena Ševců
Keyword(s):  
Metal Oxide ◽  
Green Synthesis ◽  
Chlamydomonas Reinhardtii ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Unicellular Alga

scholarly journals Novel Pressure Sensors Made from Nanocomposites (Biodegradable Polymers–Metal Oxide Nanoparticles): Fabrication and Characterization

2018 ◽  
Vol 63 (8) ◽  
pp. 754 ◽  
Author(s):  
A. Hashim ◽  
A. Hadi
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Properties ◽  
Low Cost ◽  
Metal Oxide Nanoparticles ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Oxide Nanoparticles ◽  
Ac Electrical Conductivity ◽  
Dc Electrical Conductivity ◽  
Pressure Sensitive

This paper aims to the preparation of novel pressure-sensitive nanocomposites with low cost, light weight, and good sensitivity. The nanocomposites of polyvinyl alcohol, polyacrylic acid, and lead oxide nanoparticles have been investigated. The dielectric properties and dc electrical conductivity of (PVA–PAA–PbO2) nanocomposites have been studied. The dielectric properties of nanocomposites were measured in the frequency range (100 Hz–5 MHz). The experimental results showed that the dielectric constant and dielectric loss of (PVA–PAA–PbO2) nanocomposites decrease, as the frequency increases, and they increase with the concentrations of PbO2 nanoparticles. The ac electrical conductivity of (PVA–PAA–PbO2) nanocomposites increases with the frequency and the concentrations of PbO2 nanoparticles. The dc electrical conductivity of (PVA–PAA–PbO2) nanocomposites also increases with the concentrations of PbO2 nanoparticles. The application of pressure-sensitive nanocomposites has been examined in the pressure interval (60–200) bar. The results showed that the electrical resistance of (PVA–PAA–PbO2) pressure-sensitive nanocomposites decreases, as the compressive stress increases. The (PVA–PAA–PbO2) nanocomposites have high sensitivity to pressure.

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