1
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Gisbert-González J, Briega-Martos V, Vidal-Iglesias FJ, Cuesta Á, Feliu JM, Herrero E. Spectroelectrochemical Studies of CTAB Adsorbed on Gold Surfaces in Perchloric Acid. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:2761-2770. [PMID: 36753691 PMCID: PMC9948534 DOI: 10.1021/acs.langmuir.2c03226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 01/30/2023] [Indexed: 06/18/2023]
Abstract
The behaviour of CTAB adsorbed on polycrystalline gold electrodes has been studied using a combination of spectroelectrochemical methods. The results indicate that the formation of the layer is the consequence of the precipitation of the CTAB micelles on the electrode surface as bromide ions, which stabilize the micelles, are replaced by perchlorate anions. This process leads to the formation of CTA+ layers in which perchlorate ions are intercalated, in which the adlayer suffers a continuous rearrangement that leads to the formation of micro-dominions of different types of hydrogen-bonded water populations throughout the adlayer. After prolonged cycling, a stable situation is reached. Under these conditions, water molecules permeate through the adlayer toward the electrode surface at potentials positive of the potential of zero charge, due to the repulsion between the CTA+ layer and the positive charge of the electrode.
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Affiliation(s)
| | | | | | - Ángel Cuesta
- Department
of Chemistry, School of Natural and Computing Sciences, University of Aberdeen, AB24 3UE Aberdeen, Scotland, U.K.
- Centre
for Energy Transition, University of Aberdeen, AB24 3FX Aberdeen, Scotland, U.K.
| | - Juan M. Feliu
- Instituto
de Electroquímica, Universidad de
Alicante, E-03080 Alicante, Spain
| | - E. Herrero
- Instituto
de Electroquímica, Universidad de
Alicante, E-03080 Alicante, Spain
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2
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Nguyen QN, Wang C, Shang Y, Janssen A, Xia Y. Colloidal Synthesis of Metal Nanocrystals: From Asymmetrical Growth to Symmetry Breaking. Chem Rev 2022; 123:3693-3760. [PMID: 36547384 DOI: 10.1021/acs.chemrev.2c00468] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Nanocrystals offer a unique platform for tailoring the physicochemical properties of solid materials to enhance their performances in various applications. While most work on controlling their shapes revolves around symmetrical growth, the introduction of asymmetrical growth and thus symmetry breaking has also emerged as a powerful route to enrich metal nanocrystals with new shapes and complex morphologies as well as unprecedented properties and functionalities. The success of this route critically relies on our ability to lift the confinement on symmetry by the underlying unit cell of the crystal structure and/or the initial seed in a systematic manner. This Review aims to provide an account of recent progress in understanding and controlling asymmetrical growth and symmetry breaking in a colloidal synthesis of noble-metal nanocrystals. With a touch on both the nucleation and growth steps, we discuss a number of methods capable of generating seeds with diverse symmetry while achieving asymmetrical growth for mono-, bi-, and multimetallic systems. We then showcase a variety of symmetry-broken nanocrystals that have been reported, together with insights into their growth mechanisms. We also highlight their properties and applications and conclude with perspectives on future directions in developing this class of nanomaterials. It is hoped that the concepts and existing challenges outlined in this Review will drive further research into understanding and controlling the symmetry breaking process.
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Affiliation(s)
- Quynh N. Nguyen
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia30332, United States
| | - Chenxiao Wang
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia30332, United States
| | - Yuxin Shang
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia30332, United States
| | - Annemieke Janssen
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia30332, United States
| | - Younan Xia
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia30332, United States
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia30332, United States
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3
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Ranaweera R, An S, Cao Y, Luo L. Highly efficient preconcentration using anodically generated shrinking gas bubbles for per- and polyfluoroalkyl substances (PFAS) detection. Anal Bioanal Chem 2022:10.1007/s00216-022-04175-4. [PMID: 35729349 DOI: 10.1007/s00216-022-04175-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 06/04/2022] [Accepted: 06/10/2022] [Indexed: 11/29/2022]
Abstract
Here we report a highly efficient PFAS preconcentration method that uses anodically generated shrinking gas bubbles to preconcentrate PFAS via aerosol formation, achieving ~ 1400-fold enrichment of PFOS and PFOA-the two most common PFAS-in 20 min. This new method improves the enrichment factor by 15 to 105% relative to the previous method that uses cathodically generated H2 bubbles. The shrinking gas bubbles are in situ electrogenerated by oxidizing water in an NH4HCO3 solution. H+ produced by water oxidation reacts with HCO3- to generate CO2 gas, forming gas bubbles containing a mixture of O2 and CO2. Due to the high solubility of CO2 in aqueous solutions, the CO2/O2 bubbles start shrinking when they leave the electrode surface region. A mechanistic study reveals two reasons for the improvement: (1) shrinking bubbles increase the enrichment rate, and (2) the attractive interactions between the positively charged anode and negatively charged PFAS provide high enrichment at zero bubble path length. Based on this preconcentration method, we demonstrate the detection of ≥ 70 ng/L PFOA and PFOS in water in ~ 20 min by coupling it with our bubble-nucleation-based detection method, fulfilling the need of the US Environmental Protection Agency.
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Affiliation(s)
| | - Shizhong An
- School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, 471023, China
| | - Yue Cao
- Department of Chemistry, Wayne State University, Detroit, MI, 48202, USA
| | - Long Luo
- Department of Chemistry, Wayne State University, Detroit, MI, 48202, USA.
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4
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Sabaté Del Río J, Woo HK, Park J, Ha HK, Kim JR, Cho YK. SEEDING to Enable Sensitive Electrochemical Detection of Biomarkers in Undiluted Biological Samples. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2200981. [PMID: 35429065 DOI: 10.1002/adma.202200981] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 04/11/2022] [Indexed: 06/14/2023]
Abstract
Electrochemical biosensors have shown great potential for simple, fast, and cost-effective point-of-care diagnostic tools. However, direct analysis of complex biological fluids such as plasma has been limited by the loss of sensitivity caused by biofouling. By increasing the surface area, the nanostructured electrode can improve detection sensitivity. However, like a double-edged sword, a large surface area increases the nonspecific adsorption of contaminating proteins. The use of nanoporous structures may prevent fouling proteins. However, there is no straightforward approach for creating nanostructured and nanoporous surfaces compatible with microfabricated thin-film electrodes. Herein, the preferential etching of chloride and surfactant-assisted anisotropic gold reduction to create homogeneous, nanostructured, and nanoporous gold electrodes is demonstrated, yielding a 190 ± 20 times larger surface area within a minute without using templates. This process, "surfactant-based electrochemical etch-deposit interplay for nanostructure/nanopore growth" (SEEDING), on electrodes enhances the sensitivity and antibiofouling capabilities of amperometric biosensors, enabling direct analysis of tumor-derived extracellular vesicles (tEVs) in complex biofluids with a limit of detection of 300 tEVs µL-1 from undiluted plasma and good discrimination between patients with prostate cancer from healthy ones with an area under the curve of 0.91 in urine and 0.90 in plasma samples.
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Affiliation(s)
- Jonathan Sabaté Del Río
- Center for Soft and Living Matter, Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
| | - Hyun-Kyung Woo
- Center for Soft and Living Matter, Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Juhee Park
- Center for Soft and Living Matter, Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
| | - Hong Koo Ha
- Department of Urology, Pusan National University Hospital, College of Medicine, Pusan National University, Busan, 49241, Republic of Korea
| | - Jae-Ryong Kim
- Department of Biochemistry and Molecular Biology, Smart-aging Convergence Research Center, College of Medicine, Yeungnam University, Daegu, 42415, Republic of Korea
| | - Yoon-Kyoung Cho
- Center for Soft and Living Matter, Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
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5
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Gisbert-González JM, Oliver-Pardo MV, Sarabia FJ, Climent V, Feliu JM, Herrero E. On the behavior of CTAB/CTAOH adlayers on gold single crystal surfaces. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138947] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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6
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Zhang G, Ma Y, Li M, Ren S, Fu X, Huang H, Zheng Y. Crumpled Versus Flat Gold Nanosheets: Temperature-Regulated Synthesis and Their Plasmonic and Catalytic Properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:4227-4235. [PMID: 33788565 DOI: 10.1021/acs.langmuir.1c00190] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We report a high-yield synthesis of gold (Au) nanosheets with tunable size and surface morphology in the aqueous phase. In particular, crumpled and flat Au nanosheets with a thickness of ∼10 nm could be selectively produced in high purity when the reaction was conducted at room temperature and in an ice-water bath, respectively. Unlike Au nanoplates/nanoprisms in the form of well-defined triangles or hexagons documented in previous studies, the current products exhibit random in-plane branches or holes, together with wavy edges. Strong absorbance in the NIR region was observed for all the Au nanosheet products. When serving as electrocatalysts for the ethanol oxidation reaction, the current products exhibited an enhanced activity and operation stability, as compared to quasi-spherical counterparts.
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Affiliation(s)
- Gongguo Zhang
- Department of Chemistry and Chemical Engineering, Jining University, Qufu, Shandong 273115, P. R. China
| | - Yanyun Ma
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, P. R. China
| | - Mengfan Li
- School of Materials Science and Engineering, Hunan University, Changsha, Hunan 410082, China
| | - Shan Ren
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, P. R. China
| | - Xiaowei Fu
- Department of Chemistry and Chemical Engineering, Jining University, Qufu, Shandong 273115, P. R. China
| | - Hongwen Huang
- School of Materials Science and Engineering, Hunan University, Changsha, Hunan 410082, China
| | - Yiqun Zheng
- Department of Chemistry and Chemical Engineering, Jining University, Qufu, Shandong 273115, P. R. China
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7
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Donoso-González O, Lodeiro L, Aliaga ÁE, Laguna-Bercero MA, Bollo S, Kogan MJ, Yutronic N, Sierpe R. Functionalization of Gold Nanostars with Cationic β-Cyclodextrin-Based Polymer for Drug Co-Loading and SERS Monitoring. Pharmaceutics 2021; 13:pharmaceutics13020261. [PMID: 33671975 PMCID: PMC7919026 DOI: 10.3390/pharmaceutics13020261] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 02/08/2021] [Accepted: 02/10/2021] [Indexed: 12/13/2022] Open
Abstract
Gold nanostars (AuNSs) exhibit modulated plasmon resonance and have a high SERS enhancement factor. However, their low colloidal stability limits their biomedical application as a nanomaterial. Cationic β-cyclodextrin-based polymer (CCD/P) has low cytotoxicity, can load and transport drugs more efficiently than the corresponding monomeric form, and has an appropriate cationic group to stabilize gold nanoparticles. In this work, we functionalized AuNSs with CCD/P to load phenylethylamine (PhEA) and piperine (PIP) and evaluated SERS-based applications of the products. PhEA and PIP were included in the polymer and used to functionalize AuNSs, forming a new AuNS-CCD/P-PhEA-PIP nanosystem. The system was characterized by UV–VIS, IR, and NMR spectroscopy, TGA, SPR, DLS, zeta potential analysis, FE-SEM, and TEM. Additionally, Raman optical activity, SERS analysis and complementary theoretical studies were used for characterization. Minor adjustments increased the colloidal stability of AuNSs. The loading capacity of the CCD/P with PhEA-PIP was 95 ± 7%. The physicochemical parameters of the AuNS-CCD/P-PhEA-PIP system, such as size and Z potential, are suitable for potential biomedical applications Raman and SERS studies were used to monitor PhEA and PIP loading and their preferential orientation upon interaction with the surface of AuNSs. This unique nanomaterial could be used for simultaneous drug loading and SERS-based detection.
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Affiliation(s)
- Orlando Donoso-González
- Laboratorio de Nanoquímica y Química Supramolecular, Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago 7800003, Chile;
- Laboratorio de Nanobiotecnología y Nanotoxicología, Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santos Dumont 964, Independencia, Santiago 8380000, Chile;
- Advanced Center for Chronic Diseases (ACCDiS), Universidad de Chile and Pontificia Universidad Católica de Chile, Santiago 8380000, Chile;
| | - Lucas Lodeiro
- Laboratorio de Química teórica, Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago 7800003, Chile;
| | - Álvaro E. Aliaga
- Laboratorio de Espectroscopía Vibracional, Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago 7800003, Chile;
| | - Miguel A. Laguna-Bercero
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain;
| | - Soledad Bollo
- Advanced Center for Chronic Diseases (ACCDiS), Universidad de Chile and Pontificia Universidad Católica de Chile, Santiago 8380000, Chile;
- Laboratorio de Biosensores, Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santos Dumont 964, Independencia, Santiago 8380000, Chile
| | - Marcelo J. Kogan
- Laboratorio de Nanobiotecnología y Nanotoxicología, Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santos Dumont 964, Independencia, Santiago 8380000, Chile;
- Advanced Center for Chronic Diseases (ACCDiS), Universidad de Chile and Pontificia Universidad Católica de Chile, Santiago 8380000, Chile;
| | - Nicolás Yutronic
- Laboratorio de Nanoquímica y Química Supramolecular, Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago 7800003, Chile;
- Correspondence: (N.Y.); (R.S.)
| | - Rodrigo Sierpe
- Laboratorio de Nanoquímica y Química Supramolecular, Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago 7800003, Chile;
- Laboratorio de Nanobiotecnología y Nanotoxicología, Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santos Dumont 964, Independencia, Santiago 8380000, Chile;
- Advanced Center for Chronic Diseases (ACCDiS), Universidad de Chile and Pontificia Universidad Católica de Chile, Santiago 8380000, Chile;
- Laboratorio de Biosensores, Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santos Dumont 964, Independencia, Santiago 8380000, Chile
- Correspondence: (N.Y.); (R.S.)
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8
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Shi M, Wang Z. Valence, Size, and Shape Control of Gold Nanoparticles Synthesized by Electron-Assisted Reduction. Chem Asian J 2020; 15:3904-3912. [PMID: 33021084 DOI: 10.1002/asia.202001071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Revised: 10/05/2020] [Indexed: 01/18/2023]
Abstract
An electron-assisted strategy was developed to prepare gold nanoparticles (AuNPs) at room temperature. Glow discharge plasma as electron source was successfully used to control the valence state, size, and shape of AuNPs. Stable Au(I) was obtained in 3 min by plasma, and Au(I) was reduced to zero valence with the increase in treatment time. An increase in the amount of Au did not induce an increase in particle size. A narrow size distribution was also achieved. The narrowest size distribution was observed at 9 min at 600 V. AuNPs grew slowly under glow discharge plasma, which slightly changed the mean size of AuNPs. Moreover, the average size of AuNPs was smaller under alkaline conditions. The initial pH of the solution can affect the nucleation and growth of AuNPs and further affect their particle size. Spherical AuNPs, hexagonal AuNPs, rectangular AuNPs, flower-shaped AuNPs, and Au nanorods were easily obtained within 30 min by adding different additives. The hexagonal AuNPs exhibited the largest current response toward caffeine and showed a good linear range (0.1-1000 μM) with a low detection limit (0.064 μM), because their high-energy planes can increase the electron transfer rate and improve electrocatalytic activity.
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Affiliation(s)
- Mengge Shi
- School of Chemical Engineering and Technology, Tianjin University, National Engineering Research Centre of Industry Crystallization Technology, Tianjin University, Tianjin, 300072, P. R. China
| | - Zhao Wang
- School of Chemical Engineering and Technology, Tianjin University, National Engineering Research Centre of Industry Crystallization Technology, Tianjin University, Tianjin, 300072, P. R. China
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9
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Shan B, Wang H, Li L, Zhou G, Wen Y, Chen M, Li M. Rationally designed dual-plasmonic gold nanorod@cuprous selenide hybrid heterostructures by regioselective overgrowth for in vivo photothermal tumor ablation in the second near-infrared biowindow. Am J Cancer Res 2020; 10:11656-11672. [PMID: 33052239 PMCID: PMC7546011 DOI: 10.7150/thno.51287] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 09/07/2020] [Indexed: 12/20/2022] Open
Abstract
NIR-II plasmonic materials offer multiple functionalities for in vivo biomedical applications, such as photothermal tumor ablation, surface-enhanced Raman scattering biosensing, photoacoustic imaging, and drug carriers. However, integration of noble metals and plasmonic semiconductors is greatly challenging because of the large lattice-mismatch. This study reports the regioselective overgrowth of Cu2-xSe on gold nanorods (GNRs) for preparation of dual-plasmonic GNR@Cu2-xSe hybrid heterostructures with tunable NIR-II plasmon resonance absorption for in vivo photothermal tumor ablation. Methods: The regioselective deposition of amorphous Se and its subsequent conversion into Cu2-xSe on the GNRs are performed by altering capping agents to produce the GNR@Cu2-xSe heterostructures of various morphologies. Their photothermal performances for NIR-II photothermal tumor ablation are evaluated both in vitro and in vivo. Results: We find that the lateral one- and two-side deposition, conformal core-shell coating and island growth of Cu2-xSe on the GNRs can be achieved using different capping agents. The Cu2-xSe domain size in these hybrids can be effectively adjusted by the SeO2 concentration, thereby tuning the NIR-II plasmon bands. A photothermal conversion efficiency up to 58-85% and superior photostability of these dual-plasmonic hybrids can be achieved under the NIR-II laser. Results also show that the photothermal conversion efficiency is dependent on the proportion of optical absorption converted into heat; however, the temperature rise is tightly related to the concentration of their constituents. The excellent NIR-II photothermal effect is further verified in the following in vitro and in vivo experiments. Conclusions: This study achieves one-side or two-side deposition, conformal core-shell coating, and island deposition of Cu2-xSe on GNRs for GNR@Cu2-xSe heterostructures with NIR-II plasmonic absorption, and further demonstrates their excellent NIR-II photothermal tumor ablation in vivo. This study provides a promising strategy for the rational design of NIR-II dual-plasmonic heterostructures and highlights their therapeutic in vivo potential.
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10
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da Silva JA, Netz PA, Meneghetti MR. Growth Mechanism of Gold Nanorods: the Effect of Tip-Surface Curvature As Revealed by Molecular Dynamics Simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:257-263. [PMID: 31841340 DOI: 10.1021/acs.langmuir.9b03235] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
An understanding of the anisotropic growth mechanism of gold nanorods (AuNRs) during colloidal synthesis is critical for controlling the nanocrystal size and shape and thus has implications in tuning the properties for applications in a wide range of research and technology fields. In order to investigate the role of the cetyltrimethylammonium bromide (CTAB) coating in the anisotropic growth mechanism of AuNRs, we used molecular dynamics (MD) simulations and built a computational model that considered explicitly the effect of the curvature of the gold surface on CTAB adsorption and therefore differentiated between the CTAB arrangements on flat and curved surfaces, representing the lateral and tip facets of growing AuNRs, respectively. We verified that on a curved surface, a lower CTAB coverage density and larger intermicellar channels are generated compared to those on a flat surface. Using umbrella sampling simulations, we measured the free energy profile and verified that the environment around a curved surface corresponds to an easier migration from the solution to the gold surface for the [AuBr2]- species than does a flat surface. Long unbiased molecular dynamics simulations also corroborated the umbrella sampling results. Therefore, the [AuBr2]- diffusion through the environment of the tips is much more favorable than that in the case of lateral facets. This shows that the surface curvature is an essential component of the anisotropic growth mechanism.
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Affiliation(s)
- José A da Silva
- Grupo de Catálise e Reatividade Química - GCaR, Instituto de Química e Biotecnologia , Universidade Federal de Alagoas , Av. Lourival de Melo Mota, s/n, CEP 57072-970 , Maceió , Alagoas Brazil
| | - Paulo A Netz
- Institute of Chemistry - Federal University of the Rio Grande do Sul , Av. Bento Gonçalves, 9500 CEP , 91501-970 , Porto Alegre , Rio Grande do Sul Brazil
| | - Mario R Meneghetti
- Grupo de Catálise e Reatividade Química - GCaR, Instituto de Química e Biotecnologia , Universidade Federal de Alagoas , Av. Lourival de Melo Mota, s/n, CEP 57072-970 , Maceió , Alagoas Brazil
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11
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Hermet M, Bakás L, Morcelle SR, Bernik DL. Bromide counterion as a spectroscopic sensor at the interface of cetyltrimethylammonium micelles. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 223:117266. [PMID: 31260887 DOI: 10.1016/j.saa.2019.117266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 05/31/2019] [Accepted: 06/09/2019] [Indexed: 06/09/2023]
Abstract
The strong UV absorption of the bromide in aqueous solution undergoes a remarkable red shift of more than 10 nm induced by the addition of the salts that constitute a saline buffer. The maximum absorption wavelength of the bromide is displaced from approximately 194 nm in ultrapure water to wavelengths above 200 nm, depending on the composition of the solution. The bromide spectrum as counterion of the cetyltrimethylammonium in the surfactant CTAB also shows sensitivity to the aggregation behavior of the tensioactive, being able to detect intermolecular interactions even at concentrations lower than the critical micelle concentration. And, when the micelles are assembled, the bromide absorption detects the interfacial rearrangements caused by the incorporation of ions. To know more about those interfacial features, the pyrene molecular probe was used, taking advantage of the extensive knowledge of its spectroscopy. Pyrene verifies the existence of changes in the interfacial organization which confirm that the sensitivity of the bromide spectrum is based on the ability of the ion to detect its microenvironment, and therefore reaffirms that its absorption spectrum can be used as a local sensor. The present work encourages the use of bromide as a sensor ion in the UV region between 190 and 210 nm, which would avoid the introduction of external molecular probes that could disturb the system.
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Affiliation(s)
- Melisa Hermet
- Plant Proteins Research Center (CIProVe), National University of La Plata, Calles 47 y 115, CP1900, La Plata, Buenos Aires, Argentina
| | - Laura Bakás
- Plant Proteins Research Center (CIProVe), National University of La Plata, Calles 47 y 115, CP1900, La Plata, Buenos Aires, Argentina
| | - Susana R Morcelle
- Plant Proteins Research Center (CIProVe), National University of La Plata, Calles 47 y 115, CP1900, La Plata, Buenos Aires, Argentina
| | - Delia L Bernik
- Plant Proteins Research Center (CIProVe), National University of La Plata, Calles 47 y 115, CP1900, La Plata, Buenos Aires, Argentina.
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12
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Kim MJ, Brown M, Wiley BJ. Electrochemical investigations of metal nanostructure growth with single crystals. NANOSCALE 2019; 11:21709-21723. [PMID: 31714552 DOI: 10.1039/c9nr05782j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Control over the nanoscopic structure of a material allows one to tune its properties for a wide variety of applications. Colloidal synthesis has become a convenient way to produce anisotropic metal nanostructures with a desired set of properties, but in most syntheses, the facet-selective surface chemistry causing anisotropic growth is not well-understood. This review highlights the recent use of electrochemical methods and single-crystal electrodes to investigate the roles of organic and inorganic additives in modulating the rate of atomic addition to different crystal facets. Differential capacitance and chronocoulometric techniques can be used to extract thermodynamic data on how additives selectively adsorb, while mixed potential theory can be used to observe the effect of additives on the rate of atomic addition to a specific facet. Results to date indicate that these experimental methods can provide new insights into the role capping agents and halides play in controlling anisotropic growth.
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Affiliation(s)
- Myung Jun Kim
- Department of Chemistry, Duke University, 124 Science Drive, Box 90354, Durham, North Carolina 27708, USA.
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13
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Huo D, Kim MJ, Lyu Z, Shi Y, Wiley BJ, Xia Y. One-Dimensional Metal Nanostructures: From Colloidal Syntheses to Applications. Chem Rev 2019; 119:8972-9073. [DOI: 10.1021/acs.chemrev.8b00745] [Citation(s) in RCA: 180] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Da Huo
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States
| | - Myung Jun Kim
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Zhiheng Lyu
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Yifeng Shi
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Benjamin J. Wiley
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Younan Xia
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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14
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Chen Z, Chang JW, Balasanthiran C, Milner ST, Rioux RM. Anisotropic Growth of Silver Nanoparticles Is Kinetically Controlled by Polyvinylpyrrolidone Binding. J Am Chem Soc 2019; 141:4328-4337. [DOI: 10.1021/jacs.8b11295] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhifeng Chen
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Ji Woong Chang
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Chemical Engineering, Kumoh National Institute of Technology, Gumi-si, Gyeongsangbuk-do 39177, South Korea
| | - Choumini Balasanthiran
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Scott T. Milner
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Robert M. Rioux
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, United States
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15
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Kim MJ, Alvarez S, Chen Z, Fichthorn KA, Wiley BJ. Single-Crystal Electrochemistry Reveals Why Metal Nanowires Grow. J Am Chem Soc 2018; 140:14740-14746. [DOI: 10.1021/jacs.8b08053] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Myung Jun Kim
- Department of Chemistry, Duke University, 124 Science Drive, Box 90354, Durham, North Carolina 27708, United States
| | - Samuel Alvarez
- Department of Chemistry, Duke University, 124 Science Drive, Box 90354, Durham, North Carolina 27708, United States
| | - Zihao Chen
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Kristen A. Fichthorn
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Benjamin J. Wiley
- Department of Chemistry, Duke University, 124 Science Drive, Box 90354, Durham, North Carolina 27708, United States
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16
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Fisher EA, Leung KK, Casanova-Moreno J, Masuda T, Young J, Bizzotto D. Quantifying the Selective Modification of Au(111) Facets via Electrochemical and Electroless Treatments for Manipulating Gold Nanorod Surface Composition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12887-12896. [PMID: 29058912 DOI: 10.1021/acs.langmuir.7b03021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Manipulating the composition of a mixed alkylthiol self-assembled monolayer (SAM) modified gold surface using both electrochemical and electroless methods is demonstrated. Through the use of fluorophore labeled thiolated DNA and in situ fluorescence microscopy with a gold single crystal bead electrode, a procedure was developed to study and quantify the selective desorption of an alkylthiolate SAM. This method enabled a self-consistent measurement of the removal of the SAM from the 111 surface compared to the 100 surface region at various potentials. A 20-fold increase in the electrochemical removal and replacement of the SAM from the 111 surface over the 100 surface was realized at -0.8 V/AgAgCl. A related procedure was developed for the solution-based electroless removal of the SAM using NaBH4 achieving a similar selectivity at the same potential. Unfortunately, in the electroless process fine control over the reducing potential was difficult to achieve. In addition, working in the presence of O2 complicates the solution potential measurement due to depolarization by the reduction of O2, resulting in a less clear relationship between selectivity and measured solution potential. Interestingly, the electrochemical method was not disturbed by the presence of O2. In preparation for work with Au nanorods, electrochemical measurements were performed in electrolyte that included 1 mM CTAB and was found to not interfere with this method. Preliminary results are promising for using this methodology for treatment of acid-terminated alkylthiol modified Au nanorods.
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Affiliation(s)
- Elizabeth A Fisher
- AMPEL, ‡Department of Chemistry, and §Department of Physics and Astronomy, University of British Columbia , Vancouver, BC V6T 1Z4, Canada
| | - Kaylyn K Leung
- AMPEL, ‡Department of Chemistry, and §Department of Physics and Astronomy, University of British Columbia , Vancouver, BC V6T 1Z4, Canada
| | - Jannu Casanova-Moreno
- AMPEL, ‡Department of Chemistry, and §Department of Physics and Astronomy, University of British Columbia , Vancouver, BC V6T 1Z4, Canada
| | - Tamiko Masuda
- AMPEL, ‡Department of Chemistry, and §Department of Physics and Astronomy, University of British Columbia , Vancouver, BC V6T 1Z4, Canada
| | - Jeff Young
- AMPEL, ‡Department of Chemistry, and §Department of Physics and Astronomy, University of British Columbia , Vancouver, BC V6T 1Z4, Canada
| | - Dan Bizzotto
- AMPEL, ‡Department of Chemistry, and §Department of Physics and Astronomy, University of British Columbia , Vancouver, BC V6T 1Z4, Canada
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17
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Influence of tetrabutylammonium cations on phase transition within adsorbed adlayer and lifting of reconstruction at Au(111) electrode in sulfate solution and in presence of coumarin. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.06.054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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18
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Investigations of Capping Agent Adsorption for Metal Nanoparticle Stabilization and the Formation of Anisotropic Gold Nanocrystals. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/9783527340934.ch5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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19
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Burrows ND, Harvey S, Idesis FA, Murphy CJ. Understanding the Seed-Mediated Growth of Gold Nanorods through a Fractional Factorial Design of Experiments. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:1891-1907. [PMID: 27983861 DOI: 10.1021/acs.langmuir.6b03606] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Since the development of simple, aqueous protocols for the synthesis of anisotropic metal nanoparticles, research into many promising, valuable applications of gold nanorods has grown considerably, but a number of challenges remain, including gold-particle yield, robustness to minor impurities, and precise control of gold nanorod surface chemistry. Herein we present the results of a composite fractional factorial series of experiments designed to screen seven additional potential avenues of control and to understand the seed-mediated silver-assisted synthesis of gold nanorods. These synthesis variables are the amount of sodium borohydride used and the rate of stirring when producing seed nanoparticles, the age of and the amount of seeds added, the reaction temperature, the amounts of silver nitrate and ascorbic acid added, and the age of the reduced growth solution before seed nanoparticles are added to initiate rod formation. This statistical experimental design and analysis method, besides determining which experimental variables are important and which are not when synthesizing gold nanorods (and quantifying their effects), gives further insight into the mechanism of growth by measuring the degree to which variables interact with each other by mapping out their mechanistic connections. This work demonstrates that when forming gold nanorods by the reduction of auric ions by ascorbic acid onto seed nanoparticles, ascorbic acid determines how much gold is reduced, and the amount of seeds determine how it is divided, yet both influence the intrinsic growth rates, in both width and length, of the forming nanorods. Furthermore, this work shows that the reduction of gold proceeds via direct reduction on the surface of seeds and not through a disproportionation reaction. Further control over the length of gold nanorods can be achieved by tuning the amount of silver nitrate or the reaction temperature. This work shows that silver does not directly influence rod length or width, and a new primary role for silver is proposed as a catalyst promoting the reduction of gold on the ends of forming nanorods. Furthermore, this silver catalyst is removed from the reaction by adsorption onto the surface of the growing nanorod. This work also demonstrates the importance of freshly prepared silver nitrate and ascorbic acid solutions, free from even a few hours of photodegradation, in preparing gold nanorods with high shape purity and gold yield.
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Affiliation(s)
- Nathan D Burrows
- Department of Chemistry, 600 S. Mathews Avenue, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Samantha Harvey
- Department of Chemistry, 600 S. Mathews Avenue, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Fred A Idesis
- Department of Chemistry, 600 S. Mathews Avenue, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Catherine J Murphy
- Department of Chemistry, 600 S. Mathews Avenue, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
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20
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Meena SK, Celiksoy S, Schäfer P, Henkel A, Sönnichsen C, Sulpizi M. The role of halide ions in the anisotropic growth of gold nanoparticles: a microscopic, atomistic perspective. Phys Chem Chem Phys 2016; 18:13246-54. [PMID: 27118188 PMCID: PMC5159743 DOI: 10.1039/c6cp01076h] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 04/08/2016] [Indexed: 11/21/2022]
Abstract
We provide a microscopic view of the role of halides in controlling the anisotropic growth of gold nanorods through a combined computational and experimental study. Atomistic molecular dynamics simulations unveil that Br(-) adsorption is not only responsible for surface passivation, but also acts as the driving force for CTAB micelle adsorption and stabilization on the gold surface in a facet-dependent way. The partial replacement of Br(-) by Cl(-) decreases the difference between facets and the surfactant density. Finally, in the CTAC solution, no halides or micellar structures protect the gold surface and further gold reduction should be uniformly possible. Experimentally observed nanoparticle's growth in different CTAB/CTAC mixtures is more uniform and faster as the amount of Cl(-) increases, confirming the picture from the simulations. In addition, the surfactant layer thickness measured on nanorods exposed to CTAB and CTAC quantitatively agrees with the simulation results.
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Affiliation(s)
- Santosh Kumar Meena
- Institute of Physics , Johannes Gutenberg University Mainz , Staudingerweg 7 , 55099 Mainz , Germany . ; Fax: +49 6131 39 25441 ; Tel: +49 6131 39 23641
| | - Sirin Celiksoy
- Institute of Physical Chemistry , University of Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
| | - Philipp Schäfer
- Institute of Physical Chemistry , University of Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
| | - Andreas Henkel
- Institute of Physical Chemistry , University of Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
| | - Carsten Sönnichsen
- Institute of Physical Chemistry , University of Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
| | - Marialore Sulpizi
- Institute of Physics , Johannes Gutenberg University Mainz , Staudingerweg 7 , 55099 Mainz , Germany . ; Fax: +49 6131 39 25441 ; Tel: +49 6131 39 23641
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21
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Burrows ND, Vartanian AM, Abadeer NS, Grzincic EM, Jacob LM, Lin W, Li J, Dennison JM, Hinman JG, Murphy CJ. Anisotropic Nanoparticles and Anisotropic Surface Chemistry. J Phys Chem Lett 2016; 7:632-41. [PMID: 26817922 DOI: 10.1021/acs.jpclett.5b02205] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Anisotropic nanoparticles are powerful building blocks for materials engineering. Unusual properties emerge with added anisotropy-often to an extraordinary degree-enabling countless new applications. For bottom-up assembly, anisotropy is crucial for programmability; isotropic particles lack directional interactions and can self-assemble only by basic packing rules. Anisotropic particles have long fascinated scientists, and their properties and assembly behavior have been the subjects of many theoretical studies over the years. However, only recently has experiment caught up with theory. We have begun to witness tremendous diversity in the synthesis of nanoparticles with controlled anisotropy. In this Perspective, we highlight the synthetic achievements that have galvanized the field, presenting a comprehensive discussion of the mechanisms and products of both seed-mediated and alternative growth methods. We also address recent breakthroughs and challenges in regiospecific functionalization, which is the next frontier in exploiting nanoparticle anisotropy.
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Affiliation(s)
- Nathan D Burrows
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Ariane M Vartanian
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Nardine S Abadeer
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Elissa M Grzincic
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Lisa M Jacob
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Wayne Lin
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Ji Li
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Jordan M Dennison
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Joshua G Hinman
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Catherine J Murphy
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Matthews Avenue, Urbana, Illinois 61801, United States
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22
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Effect of tetrabutylammonium cations on lifting of reconstruction and phase transitions within adsorbed adlayers at Au(100) electrode in halide electrolytes. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2015.11.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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23
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Unni B, Simon S, Burgess IJ. Electrochemical Investigations of 4-Methoxypyridine Adsorption on Au(111) Predict Its Suitability for Stabilizing Au Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:9882-9888. [PMID: 26302417 DOI: 10.1021/acs.langmuir.5b02670] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A thermodynamic analysis of the adsorption of 4-methoxypyridine (MOP) on Au(111) surfaces is presented in an effort to determine its propensity to stabilize metal nanoparticles. The adsorption of MOP is compared and contrasted to the adsorption of 4-dimethylaminopyridine (DMAP), the latter of which is well-known to form stable Au nanoparticles. Electrochemical studies show that MOP, like most pyridine derivatives, can exhibit two different adsorption states. The electrical state of the metal, the pH of the solution, and the surface crystallography determine whether MOP adopts a low-coverage, π-bonded orientation or a high-coverage, σ-type orientation. A modified Langmuir adsorption isotherm is used to extract free energies of adsorption which are roughly 10% stronger for DMAP compared to MOP at equivalent conditions when expressed on a rational basis. The higher adsorption strength is attributed to DMAP's greater Lewis basicity. Qualitatively, MOP and DMAP adsorption are found to be completely analogous, implying that MOP-protected gold particles should be stable under conditions that favor the high-coverage adsorption state. Using a previously reported, single-phase synthesis, this is shown to be the case.
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Affiliation(s)
- Bipinlal Unni
- Department of Chemistry, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5C9 Canada
| | - Sajna Simon
- Department of Chemistry, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5C9 Canada
| | - Ian J Burgess
- Department of Chemistry, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5C9 Canada
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24
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Xu CD, Ye JY, Chen L, Chen DH, Li JT, Zhen CH, Sun SG. Cyclic voltammetric studies of adsorption of cetyltrimethylammonium bromide and HBr on Pt(100) towards understanding their effects in shape-controlled synthesis of nanomaterials. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2014.12.079] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Yu ZL, Casanova-Moreno J, Guryanov I, Maran F, Bizzotto D. Influence of Surface Structure on Single or Mixed Component Self-Assembled Monolayers via in Situ Spectroelectrochemical Fluorescence Imaging of the Complete Stereographic Triangle on a Single Crystal Au Bead Electrode. J Am Chem Soc 2014; 137:276-88. [DOI: 10.1021/ja5104475] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Ivan Guryanov
- Department
of Chemistry, University of Padova, 35122 Padova, Italy
| | - Flavio Maran
- Department
of Chemistry, University of Padova, 35122 Padova, Italy
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26
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The influence of surface crystallography on the interfacial behaviour of tetrabutylammonium cations at Au(100) and Au(111) electrodes. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2014.08.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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27
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Affiliation(s)
- Maxim V Fedorov
- Department of Physics, Scottish University Physics Alliance (SUPA), University of Strathclyde , John Anderson Bldg, 107 Rottenrow, Glasgow, G4 0NG United Kingdom
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28
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Skołuda P. Acceleration of potential-induced reconstruction on Au(100) electrode by dopamine and its inhibition as an effect of dopamine oxidation. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2013.11.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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29
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Morita-Imura C, Imura Y, Kawai T, Shindo H. Recovery and redispersion of gold nanoparticles using the self-assembly of a pH sensitive zwitterionic amphiphile. Chem Commun (Camb) 2014; 50:12933-6. [DOI: 10.1039/c4cc04935g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The pH-responsive self-assembly of a zwitterionic amphiphile was expanded to the recovery of gold (Au) nanoparticles. Multilayered lamellae were incorporated into the nanoparticles. Redispersion of nanoparticles was achieved by the transition of self-assembly based on pH.
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Affiliation(s)
| | - Yoshiro Imura
- Department of Industrial Chemistry
- Tokyo University of Science
- Tokyo 162-8614, Japan
| | - Takeshi Kawai
- Department of Industrial Chemistry
- Tokyo University of Science
- Tokyo 162-8614, Japan
| | - Hitoshi Shindo
- Department of Applied Chemistry
- Chuo University
- Tokyo 112-8551, Japan
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30
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Ravi Kumar DV, Kim I, Zhong Z, Kim K, Lee D, Moon J. Cu(ii)–alkyl amine complex mediated hydrothermal synthesis of Cu nanowires: exploring the dual role of alkyl amines. Phys Chem Chem Phys 2014; 16:22107-15. [DOI: 10.1039/c4cp03880k] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The complex formation of Cu2+ ions with alkyl amines is a prerequisite for Cu nanowire synthesis. Slow reduction of this complex allows for the generation of twinned seeds, which are later grown into nanowires.
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Affiliation(s)
- D. V. Ravi Kumar
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749, Republic of Korea
| | - Inhyuk Kim
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749, Republic of Korea
| | - Zhaoyang Zhong
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749, Republic of Korea
| | - Kyujin Kim
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749, Republic of Korea
| | - Daehee Lee
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749, Republic of Korea
| | - Jooho Moon
- Department of Materials Science and Engineering
- Yonsei University
- Seoul 120-749, Republic of Korea
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31
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Kirchner K, Kirchner T, Ivaništšev V, Fedorov M. Electrical double layer in ionic liquids: Structural transitions from multilayer to monolayer structure at the interface. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.05.049] [Citation(s) in RCA: 93] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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32
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Vivek JP, Monsur A, Burgess IJ. Differential capacity and chronocoulometry studies of a quaternary ammonium surfactant adsorbed on Au(111). SURF INTERFACE ANAL 2013. [DOI: 10.1002/sia.5300] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- J. P. Vivek
- Department of Chemistry; University of Saskatchewan; Saskatoon Saskatchewan S7N 5C9 Canada
- Department of Physics E19; Technical University of Munich; James-Franck-Strasse 1 85748 Garching Germany
| | - Abrar Monsur
- Department of Chemistry; University of Saskatchewan; Saskatoon Saskatchewan S7N 5C9 Canada
| | - Ian J. Burgess
- Department of Chemistry; University of Saskatchewan; Saskatoon Saskatchewan S7N 5C9 Canada
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33
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Ravi Kumar DV, Kumavat SR, Chamundeswari VN, Patra PP, Kulkarni AA, Prasad BLV. Surfactant-free synthesis of anisotropic gold nanostructures: can dicarboxylic acids alone act as shape directing agents? RSC Adv 2013. [DOI: 10.1039/c3ra43974g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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34
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Langille MR, Personick ML, Zhang J, Mirkin CA. Defining Rules for the Shape Evolution of Gold Nanoparticles. J Am Chem Soc 2012; 134:14542-54. [DOI: 10.1021/ja305245g] [Citation(s) in RCA: 535] [Impact Index Per Article: 44.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Mark R. Langille
- Department of Chemistry and International Institute
for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Michelle L. Personick
- Department of Chemistry and International Institute
for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Jian Zhang
- Department of Chemistry and International Institute
for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Chad A. Mirkin
- Department of Chemistry and International Institute
for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
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