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Liang J, Wang K, Gong L, Zhang Z, Wang J, Cao Y, Yang T, Zeng H. High extinction coefficient material combined with multi-line lateral flow immunoassay strip for ultrasensitive detection of bacteria. Food Chem 2023; 427:136721. [PMID: 37390742 DOI: 10.1016/j.foodchem.2023.136721] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 06/22/2023] [Accepted: 06/23/2023] [Indexed: 07/02/2023]
Abstract
Lateral flow immunoassay strips (LFIAs) are a reliable and point-of-care detection method for rapid monitoring of bacteria, but their sensitivity was limited by the low extinction coefficient of colloidal gold nanoparticles (Au NPs) and low capture efficiency of test-line. In this study, polydopamine nanoparticles (PDA NPs) were employed to replace Au NPs, due to their high extinction coefficient. And the amount of test-line was increased to 5 for further improving the efficiency of bacteria capture. Thus, under visual observation, the detection limits of PDA-based LFIAs (102 CFU/mL) were about 2 orders of magnitude lower than Au-based LFIAs (104 CFU/mL). Furthermore, the invisible signal could be collected by Image J and the detection limit can reach 10 CFU/mL. The proposed test strips were successfully applied for the quantitative, accurate, and rapid screening of E. coli in food samples. This study provided a universal approach to enhance the sensitivity of bacteria LFIAs.
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Affiliation(s)
- Jianwei Liang
- School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
| | - Kuiyu Wang
- School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
| | - Liangke Gong
- School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
| | - Zhaoyang Zhang
- School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
| | - Jinhao Wang
- School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
| | - Yuhua Cao
- School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
| | - Tao Yang
- School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China.
| | - Hui Zeng
- School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China; Guangdong Youkai Science and Technology Co., Ltd., Foshan 528000, Guangdong, China.
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2
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Tukova A, Tavakkoli Yaraki M, Rodger A, Wang Y. Shape-Induced Variations in Aromatic Thiols Adsorption on Gold Nanoparticle: A Novel Method for Accurate Evaluation of Adsorbed Molecules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:15828-15836. [PMID: 37901970 DOI: 10.1021/acs.langmuir.3c02563] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/31/2023]
Abstract
Nonspherical gold nanoparticles (GNPs) are increasingly used to enhance sensitivity and selectivity in analytical methods such as surface-enhanced Raman spectroscopy (SERS) for detecting trace biomarkers. However, there is limited research on the adsorption properties of aromatic thiols onto gold nanoparticles of different morphologies, where surface curvature varies significantly at the molecular level. In this study, we investigated the adsorption kinetics of 4-mercaptobenzoic acid, an aromatic molecule, on GNPs with different shapes using SERS. Our findings revealed significant differences in the adsorption behavior and binding site preferences of aromatic thiols on GNPs with distinct morphologies. While thiol molecules consider any surface site on nanospheres equally appealing, nanostars exhibit variations in curvature and surface energy, leading to initial binding with further repositioning from the tips of the nanostar after plasmon activation. To address these differences, we proposed a universal method to evaluate the quantity of tightly bound adsorbed molecules on GNPs independently of the particle size, shape, or concentration.
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Affiliation(s)
- Anastasiia Tukova
- School of Natural Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW 2109, Australia
| | - Mohammad Tavakkoli Yaraki
- School of Natural Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW 2109, Australia
| | - Alison Rodger
- School of Natural Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW 2109, Australia
- Australian Research Council Industrial Transformation Training Centre for Facilitated Advancement of Australia's Bioactives (FAAB), Sydney, NSW 2109, Australia
| | - Yuling Wang
- School of Natural Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW 2109, Australia
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3
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Vieira Nunes Cunha I, Machado Campos A, Passarella Gerola A, Caon T. Effect of invasome composition on membrane fluidity, vesicle stability and skin interactions. Int J Pharm 2023; 646:123472. [PMID: 37788728 DOI: 10.1016/j.ijpharm.2023.123472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Revised: 09/11/2023] [Accepted: 09/30/2023] [Indexed: 10/05/2023]
Abstract
Invasomes have been widely exploited to enhance the percutaneous permeation of drugs. On the other hand, few studies have been dedicated to evaluating how their composition impacts the interaction with the skin, vesicle rigidity and stability, which was the focus of this investigation. Light scattering and spectroscopic techniques were considered for vesicle characterization. The addition of cholesterol (CHOL) into the phosphatidylcholine (PC) vesicles led to increased membrane rigidity (from PC:CHOL 5:0.5) and a concentration-dependent disorder effect on skin domains. Nevertheless, these vesicles were showed to be less stable. Ethanol, in turn, resulted in larger and more flexible vesicles, which can be attributed to its preferential distribution in headgroups of PC. The effect of limonene on membrane rigidity was dependent on the vesicle composition. It reduced the rigidity when few constituents were considered, but an opposite effect was observed for vesicles containing PC, CHOL, ethanol and limonene. Competitive effects of limonene and CHOL by the same domains in PC could explain these findings. Limonene was crucial to obtaining more monodisperse vesicles and it showed a synergistic action with CHOL in the disruption of lipid domains in the skin. Invasomes were more stable than liposomes. CHOL-free invasomes showed to be stable for up to 40 days at room temperature.
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Affiliation(s)
- Izi Vieira Nunes Cunha
- Department of Pharmaceutical Sciences, Federal University of Santa Catarina, Florianópolis 88040-900, SC, Brazil
| | - Angela Machado Campos
- Department of Pharmaceutical Sciences, Federal University of Santa Catarina, Florianópolis 88040-900, SC, Brazil
| | | | - Thiago Caon
- Department of Pharmaceutical Sciences, Federal University of Santa Catarina, Florianópolis 88040-900, SC, Brazil.
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Naguib GH, Abd El-Aziz GS, Almehmadi A, Bayoumi A, Mira AI, Hassan AH, Hamed MT. Evaluation of the time-dependent osteogenic activity of glycerol incorporated magnesium oxide nanoparticles in induced calvarial defects. Heliyon 2023; 9:e18757. [PMID: 37593643 PMCID: PMC10432181 DOI: 10.1016/j.heliyon.2023.e18757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 07/06/2023] [Accepted: 07/26/2023] [Indexed: 08/19/2023] Open
Abstract
Introduction Magnesium-based biomaterials have been explored for their potential as bone healing materials, as a result of their outstanding biodegradability and biocompatibility. These characteristics make magnesium oxide nanoparticles (MgO NPs) a promising material for treating bone disorders. The purpose of this investigation is to assess the osteogenic activity of newly-developed locally administered glycerol-incorporated MgO NPs (GIMgO NPs) in rabbits' calvarial defects. Materials and methods Characterization of GIMgO was done by X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). Bilateral calvarial defects were created in eighteen New Zealand Rabbits, of which they were divided into 3 groups with time points corresponding to 2, 4, and 6 weeks postoperatively (n = 6). One defect was implanted with absorbable gel foam impregnated with GIMgO NPs while the other was implanted with gel foam soaked with glycerol (the control). The defects were assessed using histological, Micro-Computed Tomography (Micro-CT), and histometric evaluation. Results The characterization of the GIMgO nanogel revealed the presence of MgO NPs and glycerol as well as the formation of the crystalline phase of the MgO NPs within the nanogel sample. The histological and micro-CT analysis showed time-dependent improvement of healing activity in the calvarial defects implanted with GIMgO NPs when compared to the control. Furthermore, the histometric analysis demonstrated a marked increase in the total area of new bone, connective tissue, new bone area and volume in the GIMgO NPs implanted site. Statistically, the amount of new bone formation was more significant at 6 weeks than at 2 and 4 weeks postoperatively in the calvarial defects implanted with GIMgO NPs as compared to the control. Conclusion The locally applied GIMgO NPs demonstrated efficacy in promoting bone formation, with more significant effects observed over an extended period. These findings suggest its suitability for clinical use as a therapeutic alternative to enhance bone healing.
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Affiliation(s)
- Ghada H. Naguib
- Department of Restorative Dentistry, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
- Department of Oral Biology, Cairo University School of Dentistry, Cairo, Egypt
| | - Gamal S. Abd El-Aziz
- Department of Clinical Anatomy, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Ahmad Almehmadi
- Department of Oral Biology, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Amr Bayoumi
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Abdulghani I. Mira
- Department of Restorative Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | | | - Mohamed T. Hamed
- Department of Oral and Maxillofacial Prosthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
- Department of Fixed Prosthodontics, Cairo University School of Dentistry, Cairo, Egypt
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5
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Improving the colloidal stability of PEGylated BaTiO3 nanoparticles with surfactants. Chem Phys 2023. [DOI: 10.1016/j.chemphys.2022.111701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Rapid and ultrasensitive solution-based SERS detection of drug additives in aquaculture by using polystyrene sulfonate modified gold nanobipyramids. Talanta 2023; 251:123800. [DOI: 10.1016/j.talanta.2022.123800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 06/28/2022] [Accepted: 07/06/2022] [Indexed: 11/27/2022]
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Adesoye S, Al Abdullah S, Nowlin K, Dellinger K. Mg-Doped ZnO Nanoparticles with Tunable Band Gaps for Surface-Enhanced Raman Scattering (SERS)-Based Sensing. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3564. [PMID: 36296754 PMCID: PMC9609255 DOI: 10.3390/nano12203564] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 09/28/2022] [Accepted: 10/09/2022] [Indexed: 06/16/2023]
Abstract
Semiconductors have great potential as surface-enhanced Raman scattering (SERS) substrates due to their excellent physiochemical properties. However, they provide low signal enhancements relative to their plasmonic counterparts, which necessitates innovation in their synthesis and application. Substitutional atomic doping is proposed to improve SERS enhancement by controlling electronic properties, such as the band gap. In this work, zinc oxide (ZnO) nanoparticles were synthesized by co-precipitation and doped with magnesium (Mg) at concentrations ranging from 2-10%. Nanoparticle morphology and size were obtained by scanning electron microscopy (SEM). Elemental composition and chemical states were determined using X-ray photoelectron spectroscopy (XPS). Optical properties were obtained with a UV-vis spectrophotometer, while a Raman spectrometer was used to acquire Raman signal enhancements. Stability was assessed by UV-vis spectroscopy, while cytotoxicity was evaluated by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The results showed that the absorption edge of Mg-doped ZnO nanoparticles was red-shifted compared to pure ZnO nanoparticles. The band gap decreased (3.3-3.01 eV) with increasing Mg doping, while the highest Raman enhancement was observed at 2% doping. No significant cytotoxic effects were observed at low concentrations (3-12 μg/mL). Overall, this study provides evidence for the tunability of ZnO substrates and may serve as a platform for applications in molecular biosensing.
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Affiliation(s)
- Samuel Adesoye
- Department of Nanoengineering, Joint School of Nanoscience and Nanoengineering, North Carolina A&T State University, 2907 E Gate City Blvd, Greensboro, NC 27401, USA
| | - Saqer Al Abdullah
- Department of Nanoengineering, Joint School of Nanoscience and Nanoengineering, North Carolina A&T State University, 2907 E Gate City Blvd, Greensboro, NC 27401, USA
| | - Kyle Nowlin
- Department of Nanoscience, Joint School of Nanoscience and Nanoengineering, University of North Carolina at Greensboro, 2907 E Gate City Blvd, Greensboro, NC 27401, USA
| | - Kristen Dellinger
- Department of Nanoengineering, Joint School of Nanoscience and Nanoengineering, North Carolina A&T State University, 2907 E Gate City Blvd, Greensboro, NC 27401, USA
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8
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Nieves LM, Dong YC, Rosario-Berríos DN, Mossburg K, Hsu JC, Cramer GM, Busch TM, Maidment ADA, Cormode DP. Renally Excretable Silver Telluride Nanoparticles as Contrast Agents for X-ray Imaging. ACS APPLIED MATERIALS & INTERFACES 2022; 14:34354-34364. [PMID: 35867906 PMCID: PMC9482380 DOI: 10.1021/acsami.2c06190] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The use of nanoparticles in the biomedical field has gained much attention due to their applications in biomedical imaging, drug delivery, and therapeutics. Silver telluride nanoparticles (Ag2Te NPs) have been recently shown to be highly effective computed tomography (CT) and dual-energy mammography contrast agents with good stability and biocompatibility, as well as to have potential for many other biomedical purposes. Despite their numerous advantageous properties for diagnosis and treatment of disease, the clinical translation of Ag2Te NPs is dependent on achieving high levels of excretion, a limitation for many nanoparticle types. In this work, we have synthesized and characterized a library of Ag2Te NPs and identified conditions that led to 3 nm core size and were renally excretable. We found that these nanoparticles have good biocompatibility, strong X-ray contrast generation, and rapid renal clearance. Our CT data suggest that renal elimination of nanoparticles occurred within 2 h of administration. Moreover, biodistribution data indicate that 93% of the injected dose (%ID) has been excreted from the main organs in 24 h, 95% ID in 7 days, and 97% ID in 28 days with no signs of acute toxicity in the tissues studied under histological analysis. To our knowledge, this renal clearance is the best reported for Ag2Te NP, while being comparable to the highest renal clearance reported for any type of nanoparticle. Together, the results herein presented suggest the use of GSH-Ag2Te NPs as an X-ray contrast agent with the potential to be clinically translated in the future.
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Affiliation(s)
- Lenitza M Nieves
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Biochemistry and Molecular Biophysics Graduate Group, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Yuxi C Dong
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Derick N Rosario-Berríos
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Biochemistry and Molecular Biophysics Graduate Group, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Katherine Mossburg
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Jessica C Hsu
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Gwendolyn M Cramer
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Theresa M Busch
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Andrew D A Maidment
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - David P Cormode
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Department of Cardiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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Targeting Acne Bacteria and Wound Healing In Vitro Using Plectranthus aliciae, Rosmarinic Acid, and Tetracycline Gold Nanoparticles. Pharmaceuticals (Basel) 2022; 15:ph15080933. [PMID: 36015081 PMCID: PMC9412649 DOI: 10.3390/ph15080933] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 07/03/2022] [Accepted: 07/08/2022] [Indexed: 12/01/2022] Open
Abstract
Gold nanoparticles from plant extracts and their bioactive compounds to treat various maladies have become an area of interest to many researchers. Acne vulgaris is an inflammatory disease of the pilosebaceous unit caused by the opportunistic bacteria Cutibacterium acnes and Staphylococcus epidermis. These bacteria are not only associated with inflammatory acne but also with prosthetic-implant-associated infections and wounds. Studies have hypothesised that these bacteria have a mutualistic relationship and act as a multispecies system. It is believed that these bacteria form a multispecies biofilm under various conditions and that these biofilms contribute to increased antibiotic resistance compared to single-species biofilms. This study aimed to investigate the antibacterial and wound healing potential of synthesised gold nanoparticles (AuNPs) from an endemic South African plant, Plectranthus aliciae (AuNPPAE), its major compound rosmarinic acid (AuNPRA) and a widely used antibiotic, tetracycline (AuNPTET). Synthesised gold nanoparticles were successfully formed and characterised using ultraviolet–visible spectroscopy (UV–vis), dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), zeta potential (ζ-potential), high-resolution transmission electron microscopy (HRTEM), and selected area electron diffraction (SAED), and they were investigated for stability under various biological conditions. Stable nanoparticles were formed with ζ-potentials of −18.07 ± 0.95 mV (AuNPPAE), −21.5 ± 2.66 mV (AuNPRA), and −39.83 ± 1.6 mV (AuNPTET). The average diameter of the AuNPs was 71.26 ± 0.44 nm, 29.88 ± 3.30 nm, and 132.6 ± 99.5 nm for AuNPPAE, AuNPRA, and AuNPTET, respectively. In vitro, biological studies confirmed that although no antibacterial activity or biofilm inhibition was observed for the nanoparticles tested on the multispecies C. acnes and S. epidermis systems, these samples had potential wound closure activity. Gold nanoparticles formed with rosmarinic acid significantly increased wound closure by 21.4% at 25% v/v (≈29.2 µg/mL) compared to the negative cell control and the rosmarinic acid compound at the highest concentration tested of 500 µg/mL. This study concluded that green synthesised gold nanoparticles of rosmarinic acid could potentially be used for treating wounds.
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Heidariramsheh M, Forouzandeh M, Taghavinia N, Mahdavi SM. Effect of Zn/Sn Ratio on Perovskite Solar Cell Performance Applying Off-Stoichiometric Cu 2ZnSnS 4/Carbon Hole-Collecting Electrodes. ACS APPLIED MATERIALS & INTERFACES 2022; 14:17296-17311. [PMID: 35380777 DOI: 10.1021/acsami.2c00206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Low-cost inorganic hole-transporting materials (HTMs) accompanied by a printable carbon electrode is an efficient approach to address the limitation of material cost of perovskite solar cells (PSCs) and get this technology closer to commercialization. The present work is focused on optimizing the Zn/Sn ratio of Cu2ZnSnS4/carbon hole collectors in n-i-p structured PSCs, where CuInS2/carbon is applied as the reference hole collector. This composition regulation is a solution to address the challenge of composition-related defects of the Cu2ZnSnS4 (CZTS) material. The Zn/Sn ratio was tuned by the initial proportion of the zinc precursor during the nanoparticle (NP) synthesis using a heating-up procedure. It was found that the enhancement of the Zn/Sn ratio leads to a gradual increase of the optical band gap. More importantly, an increased density of B-type defect clusters [2ZnCu + ZnSn] is confirmed using Raman results. Additionally, results from the cyclic voltammetry measurement show that by increasing the Zn/Sn value, the highest occupied molecular orbital (HOMO) of HTM is pulled down. These data match the upward trend of photovoltage. CZTS HTM with an optimal Zn/Sn ratio of 1.5 has a compatible energy level, along with the features of uniform and smooth coverage. The best efficiency of about 14.86% was obtained for optimal CZTS/carbon-based PSCs, which reaches from 14.86 to 15.49% after 25 days of aging.
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Affiliation(s)
- Maryam Heidariramsheh
- Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran 14588-89694, Iran
| | - Mozhdeh Forouzandeh
- Department of Physics, Sharif University of Technology, Tehran 11365-9161, Iran
| | - Nima Taghavinia
- Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran 14588-89694, Iran
- Department of Physics, Sharif University of Technology, Tehran 11365-9161, Iran
| | - Seyed Mohammad Mahdavi
- Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran 14588-89694, Iran
- Department of Physics, Sharif University of Technology, Tehran 11365-9161, Iran
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Khosroshahi R, Tehrani NA, Forouzandeh M, Behrouznejad F, Taghavinia N, Bagherzadeh M. Engineering of CIGS nanoparticle inks for colloidal stability, uniform film formation and application as HTL for perovskite solar cells. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2021.10.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Acharya A, Kumar A, Lee IS. Yolk@Shell Nanoreactors Carrying a Cluster of Metal Nanocrystals Stabilized Inside the Hollow Carbon Shell. B KOREAN CHEM SOC 2021. [DOI: 10.1002/bkcs.12280] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Anubhab Acharya
- Creative Research Initiative Center for Nanospace‐confined Chemical Reactions (NCCR) and Department of Chemistry Pohang University of Science and Technology (POSTECH) Pohang 37673 South Korea
| | - Amit Kumar
- Creative Research Initiative Center for Nanospace‐confined Chemical Reactions (NCCR) and Department of Chemistry Pohang University of Science and Technology (POSTECH) Pohang 37673 South Korea
| | - In Su Lee
- Creative Research Initiative Center for Nanospace‐confined Chemical Reactions (NCCR) and Department of Chemistry Pohang University of Science and Technology (POSTECH) Pohang 37673 South Korea
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Hu X, Zhang Y, Ding T, Liu J, Zhao H. Multifunctional Gold Nanoparticles: A Novel Nanomaterial for Various Medical Applications and Biological Activities. Front Bioeng Biotechnol 2020; 8:990. [PMID: 32903562 PMCID: PMC7438450 DOI: 10.3389/fbioe.2020.00990] [Citation(s) in RCA: 192] [Impact Index Per Article: 48.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 07/29/2020] [Indexed: 02/05/2023] Open
Abstract
Nanotechnology has become a trending area in science and has made great advances with the development of functional, engineered nanoparticles. Various metal nanoparticles have been widely exploited for a wide range of medical applications. Among them, gold nanoparticles (AuNPs) are widely reported to guide an impressive resurgence and are highly remarkable. AuNPs, with their multiple, unique functional properties, and easy of synthesis, have attracted extensive attention. Their intrinsic features (optics, electronics, and physicochemical characteristics) can be altered by changing the characterization of the nanoparticles, such as shape, size and aspect ratio. They can be applied to a wide range of medical applications, including drug and gene delivery, photothermal therapy (PTT), photodynamic therapy (PDT) and radiation therapy (RT), diagnosis, X-ray imaging, computed tomography (CT) and other biological activities. However, to the best of our knowledge, there is no comprehensive review that summarized the applications of AuNPs in the medical field. Therefore, in this article we systematically review the methods of synthesis, the modification and characterization techniques of AuNPs, medical applications, and some biological activities of AuNPs, to provide a reference for future studies.
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Affiliation(s)
| | | | | | - Jiang Liu
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Chinese Academy of Medical Sciences Research Unit of Oral Carcinogenesis and Management, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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Deepika MS, Thangam R, Sundarraj S, Sheena TS, Sivasubramanian S, Kulandaivel J, Thirumurugan R. Co-delivery of Diverse Therapeutic Compounds Using PEG–PLGA Nanoparticle Cargo against Drug-Resistant Bacteria: An Improved Anti-biofilm Strategy. ACS APPLIED BIO MATERIALS 2019; 3:385-399. [DOI: 10.1021/acsabm.9b00850] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Murugesan Sathiya Deepika
- Laboratory of Aquabiotics/Nanoscience, Department of Animal Science, School of Life Sciences, Bharathidasan University, Tiruchirappalli, Tamil Nadu 620 024, India
| | - Ramar Thangam
- Centre for Academic and Research Excellence (CARE), CSIR-Central Leather Research Institute, Chennai, Tamil Nadu 600 020, India
| | - Shenbagamoorthy Sundarraj
- Centre for Nanoscience and Nanotechnology, Sathyabama Institute of Science and Technology (Deemed to be University), Jeppiaar Nagar, Chennai, Tamil Nadu 600 119, India
| | - Thankaraj Salammal Sheena
- Centre for Nanoscience and Nanotechnology, Department of Physics, Bharathidasan University, Tiruchirappalli, Tamil Nadu 620 024, India
| | | | - Jeganathan Kulandaivel
- Centre for Nanoscience and Nanotechnology, Department of Physics, Bharathidasan University, Tiruchirappalli, Tamil Nadu 620 024, India
| | - Ramasamy Thirumurugan
- Laboratory of Aquabiotics/Nanoscience, Department of Animal Science, School of Life Sciences, Bharathidasan University, Tiruchirappalli, Tamil Nadu 620 024, India
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Azharuddin M, Zhu GH, Das D, Ozgur E, Uzun L, Turner APF, Patra HK. A repertoire of biomedical applications of noble metal nanoparticles. Chem Commun (Camb) 2019; 55:6964-6996. [DOI: 10.1039/c9cc01741k] [Citation(s) in RCA: 161] [Impact Index Per Article: 32.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The emerging properties of noble metal nanoparticles are attracting huge interest from the translational scientific community. In this feature article, we highlight recent advances in the adaptation of noble metal nanomaterials and their biomedical applications in therapeutics, diagnostics and sensing.
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Affiliation(s)
- Mohammad Azharuddin
- Department of Clinical and Experimental Medicine
- Linkoping University
- Linkoping
- Sweden
| | - Geyunjian H. Zhu
- Department of Chemical Engineering and Biotechnology
- University of Cambridge
- Cambridge
- UK
| | - Debapratim Das
- Department of Chemistry
- Indian Institute of Technology Guwahati
- India
| | - Erdogan Ozgur
- Hacettepe University
- Faculty of Science
- Department of Chemistry
- Ankara
- Turkey
| | - Lokman Uzun
- Hacettepe University
- Faculty of Science
- Department of Chemistry
- Ankara
- Turkey
| | | | - Hirak K. Patra
- Department of Clinical and Experimental Medicine
- Linkoping University
- Linkoping
- Sweden
- Department of Chemical Engineering and Biotechnology
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Celentano M, Jakhmola A, Profeta M, Battista E, Guarnieri D, Gentile F, Netti PA, Vecchione R. Diffusion limited green synthesis of ultra-small gold nanoparticles at room temperature. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.09.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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18
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Mourdikoudis S, Pallares RM, Thanh NTK. Characterization techniques for nanoparticles: comparison and complementarity upon studying nanoparticle properties. NANOSCALE 2018; 10:12871-12934. [PMID: 29926865 DOI: 10.1039/c8nr02278j] [Citation(s) in RCA: 574] [Impact Index Per Article: 95.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Nanostructures have attracted huge interest as a rapidly growing class of materials for many applications. Several techniques have been used to characterize the size, crystal structure, elemental composition and a variety of other physical properties of nanoparticles. In several cases, there are physical properties that can be evaluated by more than one technique. Different strengths and limitations of each technique complicate the choice of the most suitable method, while often a combinatorial characterization approach is needed. In addition, given that the significance of nanoparticles in basic research and applications is constantly increasing, it is necessary that researchers from separate fields overcome the challenges in the reproducible and reliable characterization of nanomaterials, after their synthesis and further process (e.g. annealing) stages. The principal objective of this review is to summarize the present knowledge on the use, advances, advantages and weaknesses of a large number of experimental techniques that are available for the characterization of nanoparticles. Different characterization techniques are classified according to the concept/group of the technique used, the information they can provide, or the materials that they are destined for. We describe the main characteristics of the techniques and their operation principles and we give various examples of their use, presenting them in a comparative mode, when possible, in relation to the property studied in each case.
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Affiliation(s)
- Stefanos Mourdikoudis
- Biophysics Group, Department of Physics and Astronomy, University College London, London, WC1E 6BT, UK.
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19
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Awan UA, Ali S, Rehman M, Zia N, Sohaila Naz S, Ovais M, Raza A. Stable and reproducible synthesis of gold nanorods for biomedical applications: a comprehensive study. IET Nanobiotechnol 2018; 12:182-190. [PMCID: PMC8676486 DOI: 10.1049/iet-nbt.2016.0220] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 09/17/2017] [Accepted: 09/28/2017] [Indexed: 09/26/2023] Open
Abstract
Gold nanorods (GNRs) are ideal choice in biomedical research due to their amenability of synthesis, tunable plasmonic properties, less toxicity and ease of detection but their diverse biological applications necessitate stable structure. Despite two decades' efforts made towards reproducible anisotropic structures synthesis, still the kinetic control during GNRs growth has not been achieved. This study is an attempt to apprehend thermodynamic and kinetic parameters for synthesising mono‐disperse, reproducible and highly stable GNRs with desired aspect ratios. Effects of various growth parameters and assay steps on the facile and reproducible synthesis of GNRs are analysed. GNRs' environmental and biological colloidal stability is studied through UV–Vis spectroscopy based particle instability parameter (PIP < 0.1). The authors hereby report GNRs with tunable longitudinal surface plasmon resonance (682–906 nm) having different aspect ratios (2.5–4.6) that are stable at 28–60°C; however, prolonged high temperature ( > 60°C) and alkaline pH can trigger colloidal instability. GNRs remain stable at higher salt concentration, physiological and slightly acidic pH. GNRs can be stored in 0.001 M cetyltrimethylammonium bromide for 3 months without compromising their stability. PEGylated GNRs are quite stable in cellular media solution (PIP < 0.1). With current optimised growth conditions, no aggregation at physiological pH and stability at high temperatures make GNRs an ideal candidate in biomedical applications.
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Affiliation(s)
- Uzma Azeem Awan
- Nanotheragnostic Research LabsNational Institute of Laser and OptronicsIslamabadPakistan
- Department of BiotechnologyUniversity of Azad Jammu and Kashmir MuzaffarabadMuzaffarabadPakistan
| | - Shaukat Ali
- Medical Toxicology LaboratoryDepartment of ZoologyUniversity of Azad Jammu and Kashmir MuzaffarabadMuzaffarabadPakistan
| | - Mehreen Rehman
- Nanotheragnostic Research LabsNational Institute of Laser and OptronicsIslamabadPakistan
| | - Nashmia Zia
- Nanotheragnostic Research LabsNational Institute of Laser and OptronicsIslamabadPakistan
| | - Syeda Sohaila Naz
- Nanotheragnostic Research LabsNational Institute of Laser and OptronicsIslamabadPakistan
| | - Muhammad Ovais
- Nanotheragnostic Research LabsNational Institute of Laser and OptronicsIslamabadPakistan
| | - Abida Raza
- Nanotheragnostic Research LabsNational Institute of Laser and OptronicsIslamabadPakistan
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20
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Kaur I, Ellis LJ, Romer I, Tantra R, Carriere M, Allard S, Mayne-L'Hermite M, Minelli C, Unger W, Potthoff A, Rades S, Valsami-Jones E. Dispersion of Nanomaterials in Aqueous Media: Towards Protocol Optimization. J Vis Exp 2017. [PMID: 29364209 PMCID: PMC5908381 DOI: 10.3791/56074] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The sonication process is commonly used for de-agglomerating and dispersing nanomaterials in aqueous based media, necessary to improve homogeneity and stability of the suspension. In this study, a systematic step-wise approach is carried out to identify optimal sonication conditions in order to achieve a stable dispersion. This approach has been adopted and shown to be suitable for several nanomaterials (cerium oxide, zinc oxide, and carbon nanotubes) dispersed in deionized (DI) water. However, with any change in either the nanomaterial type or dispersing medium, there needs to be optimization of the basic protocol by adjusting various factors such as sonication time, power, and sonicator type as well as temperature rise during the process. The approach records the dispersion process in detail. This is necessary to identify the time points as well as other above-mentioned conditions during the sonication process in which there may be undesirable changes, such as damage to the particle surface thus affecting surface properties. Our goal is to offer a harmonized approach that can control the quality of the final, produced dispersion. Such a guideline is instrumental in ensuring dispersion quality repeatability in the nanoscience community, particularly in the field of nanotoxicology.
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Affiliation(s)
- Inder Kaur
- School of Geography, Earth and Environmental Sciences, University of Birmingham;
| | - Laura-Jayne Ellis
- School of Geography, Earth and Environmental Sciences, University of Birmingham
| | - Isabella Romer
- School of Geography, Earth and Environmental Sciences, University of Birmingham
| | - Ratna Tantra
- Analytical Science, National Physical Laboratory
| | | | - Soline Allard
- NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay
| | | | - Caterina Minelli
- Chemical, Medical and Environmental Science, National Physical Laboratory
| | - Wolfgang Unger
- BAM Division 6.1 'Surface Analysis and Interfacial Chemistry', BAM Federal Institute for Materials Research and Testing
| | | | - Steffi Rades
- BAM Division 6.1 'Surface Analysis and Interfacial Chemistry', BAM Federal Institute for Materials Research and Testing
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21
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Uddandarao P, Balakrishnan RM. Thermal and optical characterization of biologically synthesized ZnS nanoparticles synthesized from an endophytic fungus Aspergillus flavus: A colorimetric probe in metal detection. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 175:200-207. [PMID: 28040569 DOI: 10.1016/j.saa.2016.12.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2016] [Revised: 11/25/2016] [Accepted: 12/14/2016] [Indexed: 06/06/2023]
Abstract
Nanostructured semiconductor materials are of great importance for several technological applications due to their optical and thermal properties. The design and fabrication of metal sulfide nanoparticles with tunable properties for advanced applications have drawn a great deal of attention in the field of nanotechnology. ZnS is a potential II-IV group material which is used in hetero-junction solar cells, light emitting diodes, optoelectronic devices, electro luminescent devices and photovoltaic cells. Due to their multiple applications, there is a need to elucidate their thermal and optical properties. In the present study, thermal and optical properties of biologically synthesized ZnS nanoparticles are determined in detail with Thermal Gravimetric Analysis (TGA), Derivative Thermogravimetric Analysis (DTG), Differential Scanning Calorimeter (DSC), Diffuse Reflectance Spectroscopy (DRS), Photoluminescence (PL) and Raman spectroscopy. The results reveal that ZnS NPs exhibit a very strong quantum confinement with a significant increase in their optical band gap energy. These biologically synthesized ZnS NPs contain protein residues that can selectively bind with metal ions in aqueous solutions and can exhibit an aggregation-induced color change. This phenomenon is utilized to quantitatively measure the metal concentrations of Cu2+ and Mn2+ in this study. Further the stability of nanoparticles for the metal sensing process is accessed by UV-Vis spectrometer, zeta potential and cyclic voltammeter. The selectivity and sensitivity of ZnS NPs indicate its potential use as a sensor for metal detection in the ecosystem.
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Affiliation(s)
- Priyanka Uddandarao
- Department of Chemical Engineering, National Institute of Technology Karnataka, India
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22
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Honold T, Skrybeck D, Wagner KG, Karg M. Fully Reversible Quantitative Phase Transfer of Gold Nanoparticles Using Bifunctional PNIPAM Ligands. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:253-261. [PMID: 27996278 DOI: 10.1021/acs.langmuir.6b03874] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Ligand exchange with end-functionalized polymers is often applied to render nanoparticles with enhanced colloidal stability, to change the solubility in various environments, and/or to introduce new functionalities. Here we show that exchange of citrate molecules with α-trithiocarbonate-ω-carboxyl-terminated poly(N-isopropylacrylamide) can successfully stabilize spherical gold particles of different diameters ranging from 15 to 53 nm. This is verified by transmission electron microscopy, dynamic light scattering, and extinction spectroscopy. We show that the polymer-decorated nanoparticles respond to temperature and pH allowing access to control interparticle interactions. In a range of pH slightly below the pKa of the terminal carboxyl groups, phase transfer of the particles from water to chloroform can be mediated by increasing the dispersion temperature above the lower critical solution temperature of poly(N-isopropylacrylamide). Upon cooling, fully reversible phase transfer to the water phase is observed. Extinction spectroscopy reveals phase transfer efficiencies close to 100% for every system under investigation.
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Affiliation(s)
- Tobias Honold
- Physical Chemistry I, University of Bayreuth , Universitaetsstr. 30, 95447 Bayreuth, Germany
| | - Dominik Skrybeck
- Physical Chemistry I, University of Bayreuth , Universitaetsstr. 30, 95447 Bayreuth, Germany
| | - Kristina G Wagner
- Physical Chemistry I, University of Bayreuth , Universitaetsstr. 30, 95447 Bayreuth, Germany
- Physical Chemistry I, Heinrich-Heine-University Duesseldorf , Universitaetsstr. 1, 40204 Duesseldorf, Germany
| | - Matthias Karg
- Physical Chemistry I, Heinrich-Heine-University Duesseldorf , Universitaetsstr. 1, 40204 Duesseldorf, Germany
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23
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Extensive Characterization of Oxide-Coated Colloidal Gold Nanoparticles Synthesized by Laser Ablation in Liquid. MATERIALS 2016; 9:ma9090775. [PMID: 28773897 PMCID: PMC5457073 DOI: 10.3390/ma9090775] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Revised: 09/05/2016] [Accepted: 09/12/2016] [Indexed: 12/21/2022]
Abstract
Colloidal gold nanoparticles are a widespread nanomaterial with many potential applications, but their aggregation in suspension is a critical issue which is usually prevented by organic surfactants. This solution has some drawbacks, such as material contamination and modifications of its functional properties. The gold nanoparticles presented in this work have been synthesized by ultra-fast laser ablation in liquid, which addresses the above issues by overcoating the metal nanoparticles with an oxide layer. The main focus of the work is in the characterization of the oxidized gold nanoparticles, which were made first in solution by means of dynamic light scattering and optical spectroscopy, and then in dried form by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and finally by surface potential measurements with atomic force microscopy. The light scattering assessed the nanoscale size of the formed particles and provided insight in their stability. The nanoparticles’ size was confirmed by direct imaging in transmission electron microscopy, and their crystalline nature was disclosed by X-ray diffraction. The X-ray photoelectron spectroscopy showed measurements compatible with the presence of surface oxide, which was confirmed by the surface potential measurements, which are the novel point of the present work. In conclusion, the method of laser ablation in liquid for the synthesis of gold nanoparticles has been presented, and the advantage of this physical approach, consisting of coating the nanoparticles in situ with gold oxide which provides the required morphological and chemical stability without organic surfactants, has been confirmed by using scanning Kelvin probe microscopy for the first time.
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24
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Andreou C, Neuschmelting V, Tschaharganeh DF, Huang CH, Oseledchyk A, Iacono P, Karabeber H, Colen RR, Mannelli L, Lowe SW, Kircher MF. Imaging of Liver Tumors Using Surface-Enhanced Raman Scattering Nanoparticles. ACS NANO 2016; 10:5015-26. [PMID: 27078225 PMCID: PMC4884645 DOI: 10.1021/acsnano.5b07200] [Citation(s) in RCA: 102] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Complete surgical resection is the ideal first-line treatment for most liver malignancies. This goal would be facilitated by an intraoperative imaging method that enables more precise visualization of tumor margins and detection of otherwise invisible microscopic lesions. To this end, we synthesized silica-encapsulated surface-enhanced Raman scattering (SERS) nanoparticles (NPs) that act as a molecular imaging agent for liver malignancies. We hypothesized that, after intravenous administration, SERS NPs would avidly home to healthy liver tissue but not to intrahepatic malignancies. We tested these SERS NPs in genetically engineered mouse models of hepatocellular carcinoma and histiocytic sarcoma. After intravenous injection, liver tumors in both models were readily identifiable with Raman imaging. In addition, Raman imaging using SERS NPs enabled detection of microscopic lesions in liver and spleen. We compared the performance of SERS NPs to fluorescence imaging using indocyanine green (ICG). We found that SERS NPs delineate tumors more accurately and are less susceptible to photobleaching. Given the known advantages of SERS imaging, namely, high sensitivity and specific spectroscopic detection, these findings hold promise for improved resection of liver cancer.
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Affiliation(s)
- Chrysafis Andreou
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New
York, NY 10065, USA
| | - Volker Neuschmelting
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New
York, NY 10065, USA
| | | | - Chun-Hao Huang
- Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer
Center, New York, NY 10065, USA
| | - Anton Oseledchyk
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New
York, NY 10065, USA
| | - Pasquale Iacono
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New
York, NY 10065, USA
| | - Hazem Karabeber
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New
York, NY 10065, USA
| | - Rivka R. Colen
- Department of Radiology, M.D. Anderson Cancer Center, University of
Texas, Houston, Texas, 77030, USA
| | - Lorenzo Mannelli
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New
York, NY 10065, USA
| | - Scott W. Lowe
- Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer
Center, New York, NY 10065, USA
- Howard Hughes Medical Institute, New York, NY 10065, USA
| | - Moritz F. Kircher
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New
York, NY 10065, USA
- Center for Molecular Imaging and Nanotechnology (CMINT), Memorial
Sloan Kettering Cancer Center, New York, NY 10065, USA
- Department of Radiology, Weill Cornell Medical College, New York, NY
10065, USA
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25
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Saverot S, Geng X, Leng W, Vikesland PJ, Grove TZ, Bickford LR. Facile, tunable, and SERS-enhanced HEPES gold nanostars. RSC Adv 2016. [DOI: 10.1039/c6ra00450d] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The facile, green synthesis of gold nanostars (AuNSs) with tunable branch lengths for SERS applications.
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Affiliation(s)
- S. Saverot
- Department of Biological Systems Engineering
- Virginia Tech
- Blacksburg
- USA
| | - X. Geng
- Department of Chemistry
- Virginia Tech
- Blacksburg
- USA
| | - W. Leng
- Department of Civil and Environmental Engineering
- Virginia Tech
- Blacksburg
- USA
| | - P. J. Vikesland
- Department of Civil and Environmental Engineering
- Virginia Tech
- Blacksburg
- USA
- Virginia Tech Center for Sustainable Nanotechnology
| | - T. Z. Grove
- Department of Chemistry
- Virginia Tech
- Blacksburg
- USA
| | - L. R. Bickford
- Virginia Tech Center for Sustainable Nanotechnology
- Virginia Tech
- Blacksburg
- USA
- Department of Biomedical Engineering and Mechanics
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