A Review on Synthesis and Characterization of Ag<sub>2</sub>O Nanoparticles for Photocatalytic Applications

Shume, Workneh Mechal; Murthy, H. C. Ananda; Zereffa, Enyew Amare

doi:10.1155/2020/5039479

Cited by 118 publications

(42 citation statements)

References 38 publications

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“…In another report, Deng and Zhu [ 112 ] produced nanocomposite spheres of TiO 2 /SiO 2 /Ag/Ag 2 O with a bandgap in the range of 2.19–3.01 eV. Although the Ag 2 O bulk material showed a bandgap from 1.2 to 1.43 eV [ 113 ], these values depended on the size of the particle, where the smaller the particle, the higher its bandgap. Here, the bandgap of the SiO 2 -Ag is shown in the inset of Figure 5 B, calculated from an indirect interband transition with a value of 1.81 eV.…”

Section: Resultsmentioning

confidence: 99%

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

et al. 2021

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COVID-19, as the cause of a global pandemic, has resulted in lockdowns all over the world since early 2020. Both theoretical and experimental efforts are being made to find an effective treatment to suppress the virus, constituting the forefront of current global safety concerns and a significant burden on global economies. The development of innovative materials able to prevent the transmission, spread, and entry of COVID-19 pathogens into the human body is currently in the spotlight. The synthesis of these materials is, therefore, gaining momentum, as methods providing nontoxic and environmentally friendly procedures are in high demand. Here, a highly virucidal material constructed from SiO2-Ag composite immobilized in a polymeric matrix (ethyl vinyl acetate) is presented. The experimental results indicated that the as-fabricated samples exhibited high antibacterial activity towards Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) as well as towards SARS-CoV-2. Based on the present results and radical scavenger experiments, we propose a possible mechanism to explain the enhancement of the biocidal activity. In the presence of O2 and H2O, the plasmon-assisted surface mechanism is the major reaction channel generating reactive oxygen species (ROS). We believe that the present strategy based on the plasmonic effect would be a significant contribution to the design and preparation of efficient biocidal materials. This fundamental research is a precedent for the design and application of adequate technology to the next-generation of antiviral surfaces to combat SARS-CoV-2.

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Section: Resultsmentioning

confidence: 99%

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

et al. 2021

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“…The broad absorption due to the presence of SiO2-Ag is ascribed to the Ag2O nanoparticle in the SiO2 as shown in Figure5B. The same effect was observed by Paul et al111 to Ag2O nanoparticles growth on TiO2 nanorods, in which the composite reduces the bandgap from 2.80 eV (pure TiO2) to 1.68 eV. In another report, Deng and Zhu 112 produced nanocomposite spheres of TiO2/SiO2/Ag/Ag2O with a bandgap in the range of 2.19-3.01 eV.…”

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confidence: 80%

Desenvolvimento de Novas Tecnologias Baseadas em Materiais Biocidas

Assis¹

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Primeiramente a tudo que nos faz mover, permanecer, ser, estar e mudar! Resolvi ser um pouco mais profundo e falar sobre pessoas, pessoas estas que me ajudam a seguir todo dia, porque precisamos de pessoas para crescer, precisamos de pessoas para viver.Os meus agradecimentos mais sinceros aos meus pais, João Assis e Janet Assis, por todo o esforço. Sei que minha personalidade hora conflituosa, hora teimosa me define de várias maneiras diferentes, mas não interfere no meu caráter e na minha honestidade que foi moldada por vocês. Obrigado pelos ensinamentos e pelos puxões de orelhas. Esta tese é especialmente para vocês. A meu irmão Rafael Assis, meu ponto de paz e meu porto seguro. Obrigado por me ensinar tanto e ter essa paciência gigantesca comigo. A minha cunhada e amiga Danielle Assis, que sempre esteve ao meu lado para me apoiar e me colocar para cima. Ao meu ponto de luz, meu sobrinho Kalel Assis, por me contemplar com seu sorriso puro e me fazer querer ser uma pessoa melhor. As minhas guerreiras Regina Magda, Edilamar Araújo e Aparecida Assis, por serem meus exemplos de vida, juntamente com meus tios e primos.Um agradecimento mais que especial vai ao professor Elson Longo, sinônimo de paciência, caráter e integridade. Seus ensinamentos me moldaram como pesquisador e como pessoa. Ao professor Juan Andrés, que com a sua persistência nos faz olhar o mundo com outros olhos e está sempre querendo fazer o melhor por todos os seus alunos. A prof. Eva Guillamón, pelo acolhimento, pelo riso fácil e pelo ombro amigo. Te levarei sempre comigo! Ao prof. Jefferson Bettini por estar sempre disponível a esclarecer minhas dúvidas ao longo do desenvolvimento do projeto. A prof. Rosa Llusar por todo apoio do grupo de Materiais Moleculares (UJI). Um agradecimento muito especial vai para este trio de mulheres fortes e cientistas que me acolheram e tiveram toda a paciência de me ensinar tudo o que sei até hoje, muito obrigado por tudo Tatiana Mazzo, Rafaela Silveira e Içamira Nogueira.Ao grupo do CDMF-LIEC pela troca de conhecimentos, ajuda e pelas inúmeras risadas. Ao grupo QTC-UJI, pelo acolhimento e amizade. Ao grupo de Materiales Moleculares-UJI por toda estrutura e amizade. Aos técnicos Rorivaldo Camargo, Daniela Caceta, Madalena Turssi e Sandra Bellini pela paciência e ajuda de sempre. A Nanox Tecnologia por toda a estrutura e ajuda, em especial ao Gustavo Simões, Daniel Minozzi e Guilherme Tremiliosi. Ao apoio financeiro recebido pela FAPESP, FINEP, CNPq e CAPES.Essa jornada doida que é a pós graduação tinha que ser compartilhada com outros doidos. Dentro do CDMF-LIEC tive o prazer de fazer amigos para a vida toda, e aqui quero eternizalos. A Lara Kelly por ser um pedaço de tudo, e me conhecer mais do que eu mesmo. A Amanda Gouveia por dividir tanta coisa e sempre evoluir junto comigo. A Luma Garcia por sempre me entender e ser minha parceira. A Andressa Kubo, que não ficava um dia sem tirar um sorriso do meu rosto. A Camila Foggi por cuidar e sempre estar por perto. A Roberta Yonara e Aline Brandão, que em tão pouco tem...

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“…These bands represent the vibrations of the C–H bending in the aromatic ring. Furthermore, a broad band at the range of 500 to 600 cm −1 could be attributed to Ag–O vibration [ 46 ].…”

Section: Resultsmentioning

confidence: 99%

“…Also, there were two peaks at 1715 and 1722 cm −1 which correspond to the stretching of the C=O link. Peaks between 500 and 600 cm −1 are characteristic bands attributed to lattice vibration of silver oxide [ 46 ].…”

Section: Resultsmentioning

confidence: 99%

Role of Synthetic Plant Extracts on the Production of Silver-Derived Nanoparticles

Al-Zahrani

Astudillo-Calderón

Pintos

et al. 2021

Plants

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The main antioxidants present in plant extracts—quercetin, β-carotene, gallic acid, ascorbic acid, hydroxybenzoic acid, caffeic acid, catechin and scopoletin—are able to synthesize silver nanoparticles when reacting with a Ag NO3 solution. The UV-visible absorption spectrum recorded with most of the antioxidants shows the characteristic surface plasmon resonance band of silver nanoparticles. Nanoparticles synthesised with ascorbic, hydroxybenzoic, caffeic, and gallic acids and scopoletin are spherical. Nanoparticles synthesised with quercetin are grouped together to form micellar structures. Nanoparticles synthesised by β-carotene, were triangular and polyhedral forms with truncated corners. Pentagonal nanoparticles were synthesized with catechin. We used Fourier-transform infrared spectroscopy to check that the biomolecules coat the synthesised silver nanoparticles. X-ray powder diffractograms showed the presence of silver, AgO, Ag2O, Ag3O4 and Ag2O3. Rod-like structures were obtained with quercetin and gallic acid and cookie-like structures in the nanoparticles obtained with scopoletin, as a consequence of their reactivity with cyanide. This analysis explained the role played by the various agents responsible for the bio-reduction triggered by nanoparticle synthesis in their shape, size and activity. This will facilitate targeted synthesis and the application of biotechnological techniques to optimise the green synthesis of nanoparticles.

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A Review on Synthesis and Characterization of Ag₂O Nanoparticles for Photocatalytic Applications

Cited by 118 publications

References 38 publications

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

Desenvolvimento de Novas Tecnologias Baseadas em Materiais Biocidas

Role of Synthetic Plant Extracts on the Production of Silver-Derived Nanoparticles

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A Review on Synthesis and Characterization of Ag2O Nanoparticles for Photocatalytic Applications

Cited by 118 publications

References 38 publications

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

Desenvolvimento de Novas Tecnologias Baseadas em Materiais Biocidas

Role of Synthetic Plant Extracts on the Production of Silver-Derived Nanoparticles

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A Review on Synthesis and Characterization of Ag₂O Nanoparticles for Photocatalytic Applications