1
|
Preparation of ultrafine and highly loaded silver nanoparticle composites and their highly efficient applications as reductive catalysts and antibacterial agents. J Colloid Interface Sci 2023; 629:766-777. [DOI: 10.1016/j.jcis.2022.09.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 08/28/2022] [Accepted: 09/02/2022] [Indexed: 11/23/2022]
|
2
|
Abdelmoneim HM, Taha TH, Elnouby MS, AbuShady HM. Extracellular biosynthesis, OVAT/statistical optimization, and characterization of silver nanoparticles (AgNPs) using Leclercia adecarboxylata THHM and its antimicrobial activity. Microb Cell Fact 2022; 21:277. [PMID: 36581886 PMCID: PMC9801658 DOI: 10.1186/s12934-022-01998-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 12/17/2022] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND The biosynthesis of silver nanoparticles (AgNPs) is an area of interest for researchers due to its eco-friendly approach. The use of biological approaches provides a clean and promising alternative process for the synthesis of AgNPs. We used for the first time the supernatant of Leclercia adecarboxylata THHM under optimal conditions to produce AgNPs with an acceptable antimicrobial activity against important clinical pathogens. RESULTS In this study, soil bacteria from different locations were isolated and screened for their potential to form AgNPs. The selected isolate, which was found to have the ability to biosynthesize AgNPs, was identified by molecular methods as Leclercia adecarboxylata THHM and its 16S rRNA gene was deposited in GenBank under the accession number OK605882. Different conditions were screened for the maximum production of AgNPs by the selected bacteria. Five independent variables were investigated through optimizations using one variable at a time (OVAT) and the Plackett-Burman experimental design (PBD). The overall optimal parameters for enhancing the biosynthesis of AgNPs using the supernatant of Leclercia adecarboxylata THHM as a novel organism were at an incubation time of 72.0 h, a concentration of 1.5 mM silver nitrate, a temperature of 40.0 °C, a pH of 7.0, and a supernatant concentration of 30% (v/v) under illumination conditions. The biosynthesized AgNPs have been characterized by UV-visible spectroscopy (UV-Vis), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FTIR). The biosynthesized AgNPs showed an absorption peak at 423 nm, spherical shape, and an average particle size of 17.43 nm. FTIR shows the bands at 3321.50, 2160.15, and 1636.33 cm-1 corresponding to the binding vibrations of amine, alkyne nitrile, and primary amine bands, respectively. The biosynthesized AgNPs showed antimicrobial activity against a variety of microbial pathogens of medical importance. Using resazurin-based microtiter dilution, the minimum inhibitory concentration (MIC) values for AgNPs were 500 µg/mL for all microbial pathogens except for Klebsiella pneumoniae ATCC13883, which has a higher MIC value of 1000 µg/mL. CONCLUSIONS The obtained data revealed the successful green production of AgNPs using the supernatant of Leclercia adecarboxylata THHM that can be effectively used as an antimicrobial agent against most human pathogenic microbes.
Collapse
Affiliation(s)
- Hany M. Abdelmoneim
- grid.7269.a0000 0004 0621 1570Microbiology Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| | - Tarek H. Taha
- grid.420020.40000 0004 0483 2576Environmental Biotechnology Department, Genetic Engineering and Biotechnology Research Institute (GEBRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, Alexandria, 21934 Egypt
| | - Mohamed S. Elnouby
- grid.420020.40000 0004 0483 2576Composite and Nanostructured Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, Alexandria, 21934 Egypt
| | - Hala Mohamed AbuShady
- grid.7269.a0000 0004 0621 1570Microbiology Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| |
Collapse
|
3
|
Selvamani V, Kadian S, Detwiler DA, Zareei A, Woodhouse I, Qi Z, Peana S, Alcaraz AM, Wang H, Rahimi R. Laser-Assisted Nanotexturing and Silver Immobilization on Titanium Implant Surfaces to Enhance Bone Cell Mineralization and Antimicrobial Properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:4014-4027. [PMID: 35312330 DOI: 10.1021/acs.langmuir.2c00008] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Despite the great advancement and wide use of titanium (Ti) and Ti-based alloys in different orthopedic implants, device-related infections remain the major complication in modern orthopedic and trauma surgery. Most of these infections are often caused by both poor antibacterial and osteoinductive properties of the implant surface. Here, we have demonstrated a facile two-step laser nanotexturing and immobilization of silver onto the titanium implants to improve both cellular integration and antibacterial properties of Ti surfaces. The required threshold laser processing power for effective nanotexturing and osseointegration was systematically determined by the level of osteoblast cells mineralized on the laser nanotextured Ti (LN-Ti) surfaces using a neodymium-doped yttrium aluminum garnet laser (Nd:YAG, wavelength of 1.06 μm). Laser processing powers above 24 W resulted in the formation of hierarchical nanoporous structures (average pore 190 nm) on the Ti surface with a 2.5-fold increase in osseointegration as compared to the pristine Ti surface. Immobilization of silver nanoparticles onto the LN-Ti surface was conducted by dip coating in an aqueous silver ionic solution and subsequently converted to silver nanoparticles (AgNPs) by using a low power laser-assisted photocatalytic reduction process. Structural and surface morphology analysis via XRD and SEM revealed a uniform distribution of Ag and the formation of an AgTi-alloy interface on the Ti surface. The antibacterial efficacy of the LN-Ti with laser immobilized silver (LN-Ti/LI-Ag) was tested against both Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria. The LN-Ti/LI-Ag surface was observed to have efficient and stable antimicrobial properties for over 6 days. In addition, it was found that the LN-Ti/LI-Ag maintained a cytocompatibility and bone cell mineralization property similar to the LN-Ti surface. The differential toxicity of the LN-Ti/LI-Ag between bacterial and cellular species qualifies this approach as a promising candidate for novel rapid surface modification of biomedical metal implants.
Collapse
Affiliation(s)
- Vidhya Selvamani
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-2050, United States
- Birck Nanotechnology Research Center, Purdue University, West Lafayette, Indiana 47907-2050, United States
| | - Sachin Kadian
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-2050, United States
- Birck Nanotechnology Research Center, Purdue University, West Lafayette, Indiana 47907-2050, United States
| | | | - Amin Zareei
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-2050, United States
- Birck Nanotechnology Research Center, Purdue University, West Lafayette, Indiana 47907-2050, United States
| | - Ian Woodhouse
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-2050, United States
- Birck Nanotechnology Research Center, Purdue University, West Lafayette, Indiana 47907-2050, United States
| | - Zhimin Qi
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Samuel Peana
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Alejandro M Alcaraz
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-2050, United States
| | - Haiyan Wang
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-2050, United States
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Rahim Rahimi
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-2050, United States
- Birck Nanotechnology Research Center, Purdue University, West Lafayette, Indiana 47907-2050, United States
| |
Collapse
|
4
|
Advances in Laser Ablation Synthesized Silicon-Based Nanomaterials for the Prevention of Bacterial Infection. NANOMATERIALS 2020; 10:nano10081443. [PMID: 32722023 PMCID: PMC7466518 DOI: 10.3390/nano10081443] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 07/18/2020] [Accepted: 07/22/2020] [Indexed: 12/30/2022]
Abstract
Nanomaterials have unique properties and characteristics derived from their shape and small size that are not present in bulk materials. If size and shape are decisive, the synthesis method used, which determines the above parameters, is equally important. Among the different nanomaterial’s synthesis methods, we can find chemical methods (microemulsion, sol-gel, hydrothermal treatments, etc.), physical methods (evaporation-condensation, laser treatment, etc.) and biosynthesis. Among all of them, the use of laser ablation that allows obtaining non-toxic nanomaterials (absence of foreign compounds) with a controlled 3D size, has emerged in recent years as a simple and versatile alternative for the synthesis of a wide variety of nanomaterials with numerous applications. This manuscript reviews the latest advances in the use of laser ablation for the synthesis of silicon-based nanomaterials, highlighting its usefulness in the prevention of bacterial infection.
Collapse
|
5
|
Riedel R, Mahr N, Yao C, Wu A, Yang F, Hampp N. Synthesis of gold-silica core-shell nanoparticles by pulsed laser ablation in liquid and their physico-chemical properties towards photothermal cancer therapy. NANOSCALE 2020; 12:3007-3018. [PMID: 31915777 DOI: 10.1039/c9nr07129f] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Due to the increasing scientific and biomedical interest in various nanoparticles (NPs) with excellent properties and the onset of their commercial use, a convenient and adjustable physical method for improved efficiency needs to be used for enabling their tech-scale production. Recently, great progress has been made in the large-scale production of NPs with a simple structure by pulsed laser ablation in liquid (PLAL). In this work, we synthesized gold-silica core-shell NPs by improved PLAL and provided a guide on how to investigate their physico-chemical properties and association with biological effects towards cancer photothermal therapy (PTT). By means of this method, reproducible and scalable liquid phase NPs with less toxicity and good stability can be realized for tech-scale production based on its further adjustment and modification. Moreover, a more complete investigation of the associations between the physico-chemical properties of functional NPs with complex structure and their biological effects may enable more targeted NPs towards specific requirements of biomedical applications.
Collapse
Affiliation(s)
- René Riedel
- Physical Chemistry Department of University of Marburg, Marburg, Germany.
| | | | | | | | | | | |
Collapse
|
6
|
Gellini C, Muniz-Miranda F, Pedone A, Muniz-Miranda M. SERS active Ag-SiO 2 nanoparticles obtained by laser ablation of silver in colloidal silica. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2018; 9:2396-2404. [PMID: 30254834 PMCID: PMC6142779 DOI: 10.3762/bjnano.9.224] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 08/21/2018] [Indexed: 06/08/2023]
Abstract
Highly stable Ag-SiO2 nanoparticle composites were first obtained by laser ablation of a silver target in an aqueous colloidal dispersion of silica and examined by UV-vis absorption spectroscopy, transmission electron microscopy and Raman spectroscopy. The surface enhanced Raman scattering (SERS) activity of these nanocomposites was tested using 2,2'-bipyridine as a molecular reporter and excitation in the visible and near-IR spectral regions. The computational DFT approach provided evidence of ligand adsorption on positively charged adatoms of the silver nanostructured surface, in a very similar way to the metal/molecule interaction occurring in the corresponding Ag(I) coordination compound.
Collapse
Affiliation(s)
- Cristina Gellini
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Francesco Muniz-Miranda
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 103, 41125 Modena, Italy
- Center for Molecular Modeling, Ghent University, Technologiepark 903, 9052 Zwijnaarde, Belgium
| | - Alfonso Pedone
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 103, 41125 Modena, Italy
| | - Maurizio Muniz-Miranda
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| |
Collapse
|
7
|
Ermakov VA, Silva Filho JMD, Bonato LG, Mogili NVV, Montoro FE, Iikawa F, Nogueira AF, Cesar CL, Jiménez-Villar E, Marques FC. Three-Dimensional Superlattice of PbS Quantum Dots in Flakes. ACS OMEGA 2018; 3:2027-2032. [PMID: 31458511 PMCID: PMC6641286 DOI: 10.1021/acsomega.7b01791] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Accepted: 02/07/2018] [Indexed: 05/20/2023]
Abstract
In the last two decades, many experiments were conducted in self-organization of nanocrystals into two- and three-dimensional (3D) superlattices and the superlattices were synthesized and characterized by different techniques, revealing their unusual properties. Among all characterization techniques, X-ray diffraction (XRD) is the one that has allowed the confirmation of the 3D superlattice formation due to the presence of sharp and intense diffraction peaks. In this work, we study self-organized superlattices of quantum dots of PbS prepared by dropping a monodispersed colloidal solution on a glass substrate at different temperatures. We showed that the intensity of the low-angle XRD peaks depends strongly on the drying time (substrate temperature). We claim that the peaks are originated from the 3D superlattice. Scanning electron microscopy images show that this 3D superlattice (PbS quantum dots) is formed in flake's shape, parallel to the substrate surface and randomly oriented in the perpendicular planes.
Collapse
Affiliation(s)
- Viktor A. Ermakov
- Universidade
Estadual de Campinas, IFGW, Campinas, São Paulo 13083-859, Brazil
- E-mail:
| | | | - Luiz Gustavo Bonato
- Universidade
Estadual de Campinas, IQ, Campinas, São Paulo 13083-861, Brazil
| | | | | | - Fernando Iikawa
- Universidade
Estadual de Campinas, IFGW, Campinas, São Paulo 13083-859, Brazil
| | - Ana Flavia Nogueira
- Universidade
Estadual de Campinas, IQ, Campinas, São Paulo 13083-861, Brazil
| | - Carlos Lenz Cesar
- Universidade
Estadual de Campinas, IFGW, Campinas, São Paulo 13083-859, Brazil
- Universidade
Federal do Ceará, DF, Fortaleza, Ceará 60440-900, Brazil
| | - Ernesto Jiménez-Villar
- Universidade
Estadual de Campinas, IFGW, Campinas, São Paulo 13083-859, Brazil
- Instituto
de Pesquisas Energéticas e Nucleares, CNEN, São Paulo, São Paulo 05508-000, Brazil
| | | |
Collapse
|
8
|
Wetter NU, Ramos de Miranda A, Pecoraro É, Lima Ribeiro SJ, Jimenez-Villar E. Dynamic random lasing in silica aerogel doped with rhodamine 6G. RSC Adv 2018; 8:29678-29685. [PMID: 35547269 PMCID: PMC9085255 DOI: 10.1039/c8ra04561e] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Revised: 10/22/2018] [Accepted: 08/13/2018] [Indexed: 11/30/2022] Open
Abstract
Silica aerogel is a lightweight material, well known for its good mechanical and thermal characteristics, but its optical properties have received less attention, because it is weakly scattering. Here we present for the first time the lasing properties and their complex dynamics of silica aerogel doped with R6G. It is shown that the Q factors of the lasing modes determine the operation of the laser, being either resonant or ASE-lasing. For resonant lasing, the number of resonators is easily varied and the number of modes in a single resonator and their emission frequency can be dynamically adjusted, making this a truly versatile photonics material. We demonstrate dynamically adjustable resonant lasing in silica aerogel, which makes this a truly versatile photonics material.![]()
Collapse
Affiliation(s)
| | | | - Édison Pecoraro
- Instituto de Química de Araraquara
- Universidade Estadual Paulista Júlio de Mesquita Filho
- Araraquara
- Brazil
| | - Sidney José Lima Ribeiro
- Instituto de Química de Araraquara
- Universidade Estadual Paulista Júlio de Mesquita Filho
- Araraquara
- Brazil
| | | |
Collapse
|
9
|
Assisted laser ablation: silver/gold nanostructures coated with silica. APPLIED NANOSCIENCE 2017. [DOI: 10.1007/s13204-017-0599-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
10
|
Jiménez-Villar E, da Silva IF, Mestre V, Wetter NU, Lopez C, de Oliveira PC, Faustino WM, de Sá GF. Random Lasing at Localization Transition in a Colloidal Suspension (TiO 2@Silica). ACS OMEGA 2017; 2:2415-2421. [PMID: 31457590 PMCID: PMC6641038 DOI: 10.1021/acsomega.7b00086] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 03/20/2017] [Indexed: 05/20/2023]
Abstract
Anderson localization of light and random lasing in this critical regime is an open research frontier, which besides being a basic research topic could also lead to important applications. This article investigates the random laser action at the localization transition in a strongly disordered scattering medium composed of a colloidal suspension of core-shell nanoparticles (TiO2@Silica) in ethanol solution of Rhodamine 6G. The classical superfluorescence band of the random laser was measured separately by collecting the emission at the back of the samples, showing a linear dependence with pumping fluence without gain depletion. However, frontal collection showed saturation of the absorption and emission. Narrow peaks of approximately equal intensity are observed on top of the classical superfluorescence band, indicating suppression of the interaction between the peaks modes. The linewidth of these peaks is lower than that of the passive modes of the scattering medium. A method called fraction of absorbed pumping allowed us to infer that this peak's mode (localized modes) is confined to a shallow region near the input-pumping border.
Collapse
Affiliation(s)
- Ernesto Jiménez-Villar
- Departamento
de Química Fundamental, Universidade
Federal de Pernambuco, Cidade Universitária, 50670-901 Recife, PE, Brazil
- E-mail:
| | - Iran F. da Silva
- Departamento de Química and Departamento de Física, Universidade Federal da Paraíba, Cidade Universitária, 58051-970 João Pessoa, PB, Brazil
| | - Valdeci Mestre
- Universidade
Estadual da Paraíba, CCEA, Rua Alfredo Lustosa Cabral, s/n, 58706-560 Patos, PB, Brazil
| | - Niklaus U. Wetter
- Instituto
de Pesquisas Energéticas e Nucleares, CNEN-IPEN, Rua Prof. Lineu Prestes 2242 −
Cidade Universitária, 05508-000 São Paulo, SP, Brazil
| | - Cefe Lopez
- Instituto
de Ciencia de Materiales de Madrid (CSIC), Sor Juana Inés de la Cruz, 3, 28049 Madrid, Spain
| | - Paulo C. de Oliveira
- Departamento de Química and Departamento de Física, Universidade Federal da Paraíba, Cidade Universitária, 58051-970 João Pessoa, PB, Brazil
| | - Wagner M. Faustino
- Departamento de Química and Departamento de Física, Universidade Federal da Paraíba, Cidade Universitária, 58051-970 João Pessoa, PB, Brazil
| | - Gilberto F. de Sá
- Departamento
de Química Fundamental, Universidade
Federal de Pernambuco, Cidade Universitária, 50670-901 Recife, PE, Brazil
| |
Collapse
|
11
|
Ermakov VA, Jimenez-Villar E, Silva Filho JMCD, Yassitepe E, Mogili NVV, Iikawa F, de Sá GF, Cesar CL, Marques FC. Size Control of Silver-Core/Silica-Shell Nanoparticles Fabricated by Laser-Ablation-Assisted Chemical Reduction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2257-2262. [PMID: 28186767 DOI: 10.1021/acs.langmuir.6b04308] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Aqueous colloidal silver nanoparticles have substantial potential in biological application as markers and antibacterial agents and in surface-enhanced Raman spectroscopy applications. A simple method of fabrication and encapsulation into an inert shell is of great importance today to make their use ubiquitous. Here we show that colloids of silver-core/silica-shell nanoparticles can be easily fabricated by a laser-ablation-assisted chemical reduction method and their sizes can be tuned in the range of 2.5 to 6.3 nm by simply choosing a proper water-ethanol proportion. The produced silver nanoparticles possess a porous amorphous silica shell that increases the inertness and stability of colloids, which decreases their toxicity compared with those without silica. The presence of a thin 2 to 3 nm silica shell was proved by EDX mapping. The small sizes of nanoparticles achieved by this method were analyzed using optical techniques, and they show typical photoluminescence in the UV-vis range that shifts toward higher energies with decreasing size.
Collapse
Affiliation(s)
- Victor A Ermakov
- Universidade Estadual de Campinas, IFGW , Campinas, São Paulo 13083-859, Brazil
| | | | | | - Emre Yassitepe
- Universidade Estadual de Campinas, IQ , Campinas, São Paulo 13083-859, Brazil
| | | | - Fernando Iikawa
- Universidade Estadual de Campinas, IFGW , Campinas, São Paulo 13083-859, Brazil
| | | | - Carlos Lenz Cesar
- Universidade Estadual de Campinas, IFGW , Campinas, São Paulo 13083-859, Brazil
- Universidade Federal do Ceará, DF , Fortaleza, Ceará 60440-900, Brazil
| | | |
Collapse
|
12
|
Bao H, Wang Y, Zhang H, Zhao Q, Liu G, Cai W. Ultrathin tin oxide layer-wrapped gold nanoparticles induced by laser ablation in solutions and their enhanced performances. J Colloid Interface Sci 2017; 489:92-99. [PMID: 27592728 DOI: 10.1016/j.jcis.2016.08.065] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 08/24/2016] [Accepted: 08/25/2016] [Indexed: 10/21/2022]
Abstract
A simple and flexible method of preparing an ultrathin semiconducting oxide layer-wrapped gold nanoparticles (NPs) is presented. The method is a single-step procedure based on laser ablation in a precursor solution. The spherical Au NPs (<20nm in mean size) wrapped with a SnO2 layer of approximately 2nm in thickness are formed after the laser ablation of a gold target in SnCl4 solutions with concentrations of 0.01-0.1M. The thickness of such SnO2 shell is nearly independent of Au particle sizes. Results reveal that the formation of Au@SnO2 NPs involves a two-step process: the laser ablation-induced formation of Au NPs and subsequent Coulomb effect-based colloidal attachment and self-assembly on the Au NPs. Au@SnO2 NPs-built film exhibits significantly stronger surface-enhanced Raman scattering effect to organic phosphor molecules (phenylphosphonic acid) and much better gas sensing performance to H2S at room temperature compared with the bare Au NPs and pure SnO2 NPs films, respectively. This work presents a simple route to fabricating noble-metal NPs wrapped with symmetrical and ultrathin semiconducting oxide shells.
Collapse
Affiliation(s)
- Haoming Bao
- Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, PR China; University of Science and Technology of China, Hefei 230026, PR China
| | - Yingying Wang
- Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, PR China
| | - Hongwen Zhang
- Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, PR China.
| | - Qian Zhao
- Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, PR China
| | - Guangqiang Liu
- Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, PR China
| | - Weiping Cai
- Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, PR China; University of Science and Technology of China, Hefei 230026, PR China.
| |
Collapse
|
13
|
Zhang S, Tang Y, Vlahovic B. A Review on Preparation and Applications of Silver-Containing Nanofibers. NANOSCALE RESEARCH LETTERS 2016; 11:80. [PMID: 26858162 PMCID: PMC4747935 DOI: 10.1186/s11671-016-1286-z] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 01/28/2016] [Indexed: 06/02/2023]
Abstract
Silver-containing nanofibers are of great interest recently because of the dual benefits from silver particles and nanofibers. Silver nanoparticles are extensively used for biomedical applications due to the antibacterial and antiviral properties. In addition, silver nanoparticles can excite resonance effect of light trapping when pairing with dielectric materials, such as polymer. Comparing to the traditional fabrics, polymer nanofibers can provide larger number of reaction sites and higher permeability contributed to their high surface-to-volume ratio and high porosity. By embedding the silver nanoparticles into polymer nanofiber matrix, the composite is promising candidates for biomaterials, photovoltaic materials, and catalysts. This work demonstrates and evaluates the methods employed to synthesize silver nanoparticle-containing nanofibers and their potential applications.
Collapse
Affiliation(s)
- Shu Zhang
- Department of Mathematics and Physics, North Carolina Central University, Durham, NC, 27707, USA
| | - Yongan Tang
- Department of Mathematics and Physics, North Carolina Central University, Durham, NC, 27707, USA.
| | - Branislav Vlahovic
- Department of Mathematics and Physics, North Carolina Central University, Durham, NC, 27707, USA
| |
Collapse
|
14
|
Jimenez-Villar E, da Silva IF, Mestre V, de Oliveira PC, Faustino WM, de Sá GF. Anderson localization of light in a colloidal suspension (TiO2@silica). NANOSCALE 2016; 8:10938-10946. [PMID: 26804337 DOI: 10.1039/c5nr07540h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In recent years, there has been dramatic progress in the photonics field in disordered media, ranging from applications in solar collectors, photocatalyzers, random lasing, and other novel photonic functions, to investigations into fundamental topics, such as light confinement and other phenomena involving photon interactions. This paper reports several pieces of experimental evidence of localization transition in a strongly disordered scattering medium composed of a colloidal suspension of core-shell nanoparticles (TiO2@silica) in ethanol solution. We demonstrate the crossover from a diffusive transport to a localization transition regime as the nanoparticle concentration is increased, and that an enhanced absorption effect arises at localization transition.
Collapse
Affiliation(s)
- Ernesto Jimenez-Villar
- Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, Pernambuco 50670-901, Brazil.
| | | | | | | | | | | |
Collapse
|