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Chokkareddy R, Kanchi S, Inamuddin. A Mini Review on Surface-Enhanced Raman Scattering based Nanoclusters
for Sensing and Imaging Applications. CURR ANAL CHEM 2022. [DOI: 10.2174/1573411017999210101162831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
The invention of enhanced Raman scattering by adsorbing molecules on nanostructured metal
surfaces is a milestone in the development of spectroscopic and analytical techniques. Important experimental and
theoretical efforts were geared towards understanding the Surface Enhanced Raman Scattering effect (SERS) and evaluating
its significance in a wide range of fields in different types of ultrasensitive sensing applications.
Methods:
Metal nanoclusters have been widely studied due to their unique structure and individual properties, which place
them among single metal atoms and larger nanoparticles. In general, the nanoparticles with a size less than 2 nm is defined
as nanoclusters (NCs) and they possess distinct optical properties. In addition, the excited electrons from absorption bands
results in the emission of positive luminescence associated to the quantum size effect in which separate energy levels are
produced.
Results:
It is demonstrated that fluorescent based SERS investigations of metal nanoparticles have showed more
photostability, high compatibility, and good water solubility, has resulted in high sensitivity, better imaging and sensing
experience in the biomedical applications.
Conclusion:
In the present review, we report recent trends in the synthesis of metal nanoclusters and their applications in
biosensing and bio-imaging applications due some benefits including cost-effectiveness, easy synthesis routes and less
consumption of sample volumes. Outcomes of this study confirms that SERS based fluorescent nanoclusters could be one
of thrust research areas in biochemistry and biomedical engineering.
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Affiliation(s)
| | - Suvardhan Kanchi
- Department of Chemistry, Durban University of Technology, Durban 4000, South Africa
| | - Inamuddin
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589,Saudi Arabia
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Torres-Ferrer LR, López-Romero JM, Mendez-Nonell J, Rivas-Arreola MJ, Moreno-Ríos M, Ávila-Dávila EO, Prokhorov E, Kovalenko Y, Zárate-Triviño DG, Revilla-Vazquez JR, Meraz-Rios MA, Luna-Barcenas G. Tuning HAuCl4/Sodium Citrate Stoichiometry to Fabricate Chitosan-Au Nanocomposites. Polymers (Basel) 2022; 14:polym14040788. [PMID: 35215700 PMCID: PMC8879739 DOI: 10.3390/polym14040788] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 01/20/2022] [Accepted: 01/28/2022] [Indexed: 02/07/2023] Open
Abstract
Nanocomposite engineering of biosensors, biomaterials, and flexible electronics demand a highly tunable synthesis of precursor materials to achieve enhanced or desired properties. However, this process remains limited due to the need for proper synthesis-property strategies. Herein, we report on the ability to synthesize chitosan-gold nanocomposite thin films (CS/AuNP) with tunable properties by chemically reducing HAuCl4 in chitosan solutions and different HAuCl4/sodium citrate molar relationships. The structure, electrical, and relaxation properties of nanocomposites have been investigated as a function of HAuCl4/sodium citrate molar relation. It was shown that gold particle size, conductivity, Vogel temperature (glass transition), and water content strongly depend upon HAuCl4/sodium citrate relationships. Two relaxation processes have been observed in nanocomposites; the α-relaxation process, related to a glass transition in wet CS/AuNP films, and the σ-relaxation related to the local diffusion process of ions in a disordered system. The ability to fine-tune both α- and σ-relaxations may be exploited in the proper design of functional materials for biosensors, biomaterials, and flexible electronics applications.
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Affiliation(s)
- Luis R. Torres-Ferrer
- Nanosciences & Nanotechnology Program, Cinvestav Zacatenco, Ciudad de Mexico 07360, Mexico;
| | | | | | - Maria J. Rivas-Arreola
- Department of Sciences & Engineering, Universidad Iberoamericana, San Andrés Cholula 72820, Mexico;
| | - Marisa Moreno-Ríos
- Department of Postgraduates Studies and Investigation, Tecnologico Nacional de Mexico, Instituto Tecnológico de Pachuca, Pachuca 42080, Mexico; (M.M.-R.); (E.O.Á.-D.)
| | - Erika O. Ávila-Dávila
- Department of Postgraduates Studies and Investigation, Tecnologico Nacional de Mexico, Instituto Tecnológico de Pachuca, Pachuca 42080, Mexico; (M.M.-R.); (E.O.Á.-D.)
| | - Evgeny Prokhorov
- Cinvestav Querétaro, Querétaro 76230, Mexico; (J.M.L.-R.); (E.P.); (Y.K.)
| | - Yuriy Kovalenko
- Cinvestav Querétaro, Querétaro 76230, Mexico; (J.M.L.-R.); (E.P.); (Y.K.)
| | - Diana G. Zárate-Triviño
- Immunology and virology Laboratory, Universidad Autónoma de Nuevo León, Monterrey 64450, Mexico
- Correspondence: (D.G.Z.-T.); (J.R.R.-V.); (M.A.M.-R.); (G.L.-B.)
| | - Javier R. Revilla-Vazquez
- Department of Engineering & Technology, Division of Chemical Sciences, FES-Cuautitlan, Universidad Nacional Autónoma de Mexico, Cuatitlan Izcalli 54740, Mexico
- Correspondence: (D.G.Z.-T.); (J.R.R.-V.); (M.A.M.-R.); (G.L.-B.)
| | - Marco A. Meraz-Rios
- Department of Molecular Biomedicine, Cinvestav Zacatenco, Ciudad de Mexico 07360, Mexico
- Correspondence: (D.G.Z.-T.); (J.R.R.-V.); (M.A.M.-R.); (G.L.-B.)
| | - Gabriel Luna-Barcenas
- Cinvestav Querétaro, Querétaro 76230, Mexico; (J.M.L.-R.); (E.P.); (Y.K.)
- Correspondence: (D.G.Z.-T.); (J.R.R.-V.); (M.A.M.-R.); (G.L.-B.)
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Wang L, Patskovsky S, Gauthier-Soumis B, Meunier M. Porous Au-Ag Nanoparticles from Galvanic Replacement Applied as Single-Particle SERS Probe for Quantitative Monitoring. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2105209. [PMID: 34761520 DOI: 10.1002/smll.202105209] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Revised: 09/30/2021] [Indexed: 06/13/2023]
Abstract
Plasmonic nanostructures have raised the interest of biomedical applications of surface-enhanced Raman scattering (SERS). To improve the enhancement and produce sensitive SERS probes, porous Au-Ag alloy nanoparticles (NPs) are synthesized by dealloying Au-Ag alloy NP-precursors with Au or Ag core in aqueous colloidal environment through galvanic replacement reaction. The novel designed core-shell Au-Ag alloy NP-precursors facilitate controllable synthesis of porous nanostructure, and dealloying degree during the reaction has significant effect on structural and spectral properties of dealloyed porous NPs. Narrow-dispersed dealloyed NPs are obtained using NPs of Au/Ag ratio from 10/90 to 40/60 with Au and Ag core to produce solid core@porous shell and porous nanoshells, having rough surface, hollowness, and porosity around 30-60%. The clean nanostructure from colloidal synthesis exhibits a redshifted plasmon peak up to near-infrared region, and the large accessible surface induces highly localized surface plasmon resonance and generates robust SERS activity. Thus, the porous NPs produce intensely enhanced Raman signal up to 68-fold higher than 100 nm AuNP enhancement at single-particle level, and the estimated Raman enhancement around 7800, showing the potential for highly sensitive SERS probes. The single-particle SERS probes are effectively demonstrated in quantitative monitoring of anticancer drug Doxorubicin release.
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Affiliation(s)
- Lu Wang
- Laser Processing and Plasmonics Laboratory, Department of Engineering Physics, Polytechnique Montréal, C.P. 6079, Succ. Centre-ville, Montréal, Québec, H3C 3A7, Canada
| | - Sergiy Patskovsky
- Laser Processing and Plasmonics Laboratory, Department of Engineering Physics, Polytechnique Montréal, C.P. 6079, Succ. Centre-ville, Montréal, Québec, H3C 3A7, Canada
| | - Bastien Gauthier-Soumis
- Laser Processing and Plasmonics Laboratory, Department of Engineering Physics, Polytechnique Montréal, C.P. 6079, Succ. Centre-ville, Montréal, Québec, H3C 3A7, Canada
| | - Michel Meunier
- Laser Processing and Plasmonics Laboratory, Department of Engineering Physics, Polytechnique Montréal, C.P. 6079, Succ. Centre-ville, Montréal, Québec, H3C 3A7, Canada
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4
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Zhang Y, Hu X, Wang Q. Review of microchip analytical methods for the determination of pathogenic Escherichia coli. Talanta 2021; 232:122410. [PMID: 34074400 DOI: 10.1016/j.talanta.2021.122410] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 03/28/2021] [Accepted: 04/07/2021] [Indexed: 12/13/2022]
Abstract
Bacterial infections remain the principal cause of mortality worldwide, making the detection of pathogenic bacteria highly important, especially Escherichia coli (E. coli). Current E. coli detection methods are labour-intensive, time-consuming, or require expensive instrumentation, making it critical to develop new strategies that are sensitive and specific. Microchips are an automated analytical technique used to analyse food based on their separation efficiency and low analyte consumption, which make them the preferred method to detect pathogenic bacteria. This review presents an overview of microchip-based analytical methods for analysing E. coli, which were published in recent years. Specifically, this review focuses on current research based on microchips for the detection of E. coli and reviews the limitations of microchip-based methods and future perspectives for the analysis of pathogenic bacteria.
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Affiliation(s)
- Yan Zhang
- Faculty of Science, Kunming University of Science and Technology, Kunming, 650500, China; School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai, 200241, PR China
| | - Xianzhi Hu
- Faculty of Science, Kunming University of Science and Technology, Kunming, 650500, China.
| | - Qingjiang Wang
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai, 200241, PR China.
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Jiang Y, Wang L, Meunier M, Mirsaidov U. Formation Pathways of Porous Alloy Nanoparticles through Selective Chemical and Electrochemical Etching. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2006953. [PMID: 33719189 DOI: 10.1002/smll.202006953] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 01/13/2021] [Indexed: 06/12/2023]
Abstract
Porous alloy nanomaterials are important for applications in catalysis, sensing, and actuation. Chemical and electrochemical etching are two methods to form porous nanostructures by dealloying bimetallic nanoparticles (NPs). However, it is not clear how the NPs evolve during these etching processes. Insight into the morphological and compositional transformations of the NPs during the etching is critical to understanding the nanoscale details of the dealloying process. Here, using in situ liquid phase transmission electron microscopy, the structural evolution of individual AuAg alloy NPs is tracked during both chemical and electrochemical etching of their Ag component. The observations show that the electrochemical etching produces NPs with more uniform pore sizes than the chemical etching and enables tuning the NPs porosity by modulating the electrochemical potential. The results show that at the initial stages of both etching methods, Au-rich passivation layer forms on the surface of the NPs, which is critical in preserving the NP's porous shell as pores form underneath this layer during the etching. These findings describing the selective etching and dealloying of AuAg NPs provide a critical insight needed to control the morphology and composition of porous multimetallic NPs, and paves the way for synthesizing nanomaterials with tailored chemical and physical properties for various applications.
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Affiliation(s)
- Yingying Jiang
- Department of Physics, National University of Singapore, Singapore, 117551, Singapore
- Centre for BioImaging Sciences, Department of Biological Sciences, National University of Singapore, Singapore, 117557, Singapore
| | - Lu Wang
- Laser Processing and Plasmonics Laboratory, Department of Engineering Physics, Polytechnique Montréal, Montréal, QC, H3C 3AT, Canada
| | - Michel Meunier
- Laser Processing and Plasmonics Laboratory, Department of Engineering Physics, Polytechnique Montréal, Montréal, QC, H3C 3AT, Canada
| | - Utkur Mirsaidov
- Department of Physics, National University of Singapore, Singapore, 117551, Singapore
- Centre for BioImaging Sciences, Department of Biological Sciences, National University of Singapore, Singapore, 117557, Singapore
- Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore, 117546, Singapore
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
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6
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Guo X, Wang X, Huang D, Zhang J, Xu D, Yang W, Hu Q, Fang Z, Huang T. Method study on determination of total purine content in fish meat by diazotization reaction combined with SERS. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2020.109027] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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7
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Xu J, Luo F, Li J, Yang K, Li H. Poly (amic acid) Salt‐stabilized Au‐Ag Alloy Nanoparticles as Efficient and Recyclable Quasi‐homogeneous Catalysts for the Imines Synthesis from Alcohols and Amines in Water. ChemistrySelect 2019. [DOI: 10.1002/slct.201902475] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Jiali Xu
- School of Materials Science and EngineeringCentral South University 932 South Lushan Road Changsha 410083 China
| | - Faguo Luo
- School of Materials Science and EngineeringCentral South University 932 South Lushan Road Changsha 410083 China
| | - Jun Li
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and ChemistryHunan University of Technology 88 Taishan Road Zhuzhou 412007 China
| | - Ke Yang
- School of Materials Science and EngineeringCentral South University 932 South Lushan Road Changsha 410083 China
| | - Hengfeng Li
- School of Materials Science and EngineeringCentral South University 932 South Lushan Road Changsha 410083 China
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8
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Ultrasensitive immunoassay of Staphylococcus aureus based on colorimetric and fluorescent responses of 4-chloro-7-nitrobenzo-2-oxa-1,3-diazole to l-cysteine. Talanta 2019; 202:244-250. [DOI: 10.1016/j.talanta.2019.04.076] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 04/24/2019] [Accepted: 04/28/2019] [Indexed: 11/22/2022]
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9
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Liao TW, Yadav A, Hu KJ, van der Tol J, Cosentino S, D'Acapito F, Palmer RE, Lenardi C, Ferrando R, Grandjean D, Lievens P. Unravelling the nucleation mechanism of bimetallic nanoparticles with composition-tunable core-shell arrangement. NANOSCALE 2018; 10:6684-6694. [PMID: 29589035 DOI: 10.1039/c8nr01481g] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The structure and atomic ordering of Au-Ag nanoparticles grown in the gas phase are determined by a combination of HAADF-STEM, XPS and Refl-XAFS techniques as a function of composition. It is shown consistently from all the techniques that an inversion of chemical ordering takes place by going from Au-rich to Ag-rich compositions, with the minority element always occupying the nanoparticle core, and the majority element enriching the shell. With the aid of DFT calculations, this composition-tunable chemical arrangement is rationalized in terms of a four-step growth process in which the very first stage of cluster nucleation plays a crucial role. The four-step growth mechanism is based on mechanisms of a general character, likely to be applicable to a variety of binary systems besides Au-Ag.
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Affiliation(s)
- Ting-Wei Liao
- Laboratory of Solid-State Physics and Magnetism, KU Leuven, Celestijnenlaan 200D - Box 2414, 3001 Leuven, Belgium.
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10
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Ingram W, Larson S, Carlson D, Zhao Y. Ag-Cu mixed phase plasmonic nanostructures fabricated by shadow nanosphere lithography and glancing angle co-deposition. NANOTECHNOLOGY 2017; 28:015301. [PMID: 27897147 DOI: 10.1088/0957-4484/28/1/015301] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
By combining shadow nanosphere lithography with a glancing angle co-deposition technique, mixed-phase Ag-Cu triangular nanopatterns and films were fabricated. They were prepared at different compositions with respect to Ag from 100% to 0% by changing the relative deposition ratio of each metal. Characterizations by ellipsometry, energy dispersive x-ray spectroscopy, and x-ray diffraction revealed that the thin films and nanopatterns were composed of small, well-mixed Ag and Cu nano-grains with a diameter less than 20 nm, and their optical properties could be described by an effective medium theory. All compositions of the nanopattern had the same shape, but showed tunable localized surface plasmon resonance (LSPR) properties. In general, the LSPR of the nanopatterns redshifted with decreasing composition. Such a relation could be fitted by an empirical model based on the bulk theory of alloy plasmonics. By changing the colloidal template and the material deposited, this fabrication technique can be used to produce other alloy plasmonic nanostructures with predicted LSPR wavelengths.
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Affiliation(s)
- Whitney Ingram
- Department of Physics and Astronomy, University of Georgia, Athens, GA 30602, USA
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Choi JR, Shin DM, Song H, Lee D, Kim K. Current achievements of nanoparticle applications in developing optical sensing and imaging techniques. NANO CONVERGENCE 2016; 3:30. [PMID: 28191440 PMCID: PMC5271156 DOI: 10.1186/s40580-016-0090-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 10/22/2016] [Indexed: 05/25/2023]
Abstract
Metallic nanostructures have recently been demonstrated to improve the performance of optical sensing and imaging techniques due to their remarkable localization capability of electromagnetic fields. Particularly, the zero-dimensional nanostructure, commonly called a nanoparticle, is a promising component for optical measurement systems due to its attractive features, e.g., ease of fabrication, capability of surface modification and relatively high biocompatibility. This review summarizes the work to date on metallic nanoparticles for optical sensing and imaging applications, starting with the theoretical backgrounds of plasmonic effects in nanoparticles and moving through the applications in Raman spectroscopy and fluorescence biosensors. Various efforts for enhancing the sensitivity, selectivity and biocompatibility are summarized, and the future outlooks for this field are discussed. Convergent studies in optical sensing and imaging have been emerging field for the development of medical applications, including clinical diagnosis and therapeutic applications.
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Affiliation(s)
- Jong-ryul Choi
- Medical Device Development Center, Daegu-Gyeongbuk Medical Innovation Foundation (DGMIF), Daegu, 41061 Republic of Korea
| | - Dong-Myeong Shin
- Research Center for Energy Convergence Technology, Pusan National University, Busan, 46241 Republic of Korea
| | - Hyerin Song
- Department of Cogno-Mechatronics Engineering, Pusan National University, Busan, 46241 Republic of Korea
| | - Donghoon Lee
- Department of Psychology, Pusan National University, Busan, 46241 Republic of Korea
| | - Kyujung Kim
- Department of Cogno-Mechatronics Engineering, Pusan National University, Busan, 46241 Republic of Korea
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Harrington JA, Harms ZD, Zaleski JM. Electrostatic assembly of gold nanorods on a glass substrate for sustainable photocatalytic reduction via sodium borohydride. RSC Adv 2016. [DOI: 10.1039/c6ra09613a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Gold nanorods were adhered onto a glass substrate for use as a sustainable, reusable photocatalyst to reduce 4-nitroaniline with sodium borohydride.
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Bankura K, Rana D, Mollick MMR, Pattanayak S, Bhowmick B, Saha NR, Roy I, Midya T, Barman G, Chattopadhyay D. Dextrin-mediated synthesis of Ag NPs for colorimetric assays of Cu 2+ ion and Au NPs for catalytic activity. Int J Biol Macromol 2015; 80:309-16. [DOI: 10.1016/j.ijbiomac.2015.06.058] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Revised: 06/20/2015] [Accepted: 06/29/2015] [Indexed: 12/18/2022]
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14
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Kim WJ, Choi JB, Kim S, Kim AR, Yoo DJ. Preparation and Characterization of a Triple Layered Au-PMMA-PbSe Hybrid Nanocomposite: Manipulation of PMMA Spacer Layer by Oxygen Plasma Etching. B KOREAN CHEM SOC 2015. [DOI: 10.1002/bkcs.10379] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Wan-Joong Kim
- Biomed Research Team; Electronics and Telecommunications Research Institute; Daejeon 305-700 Republic of Korea
| | - Jae Bong Choi
- Department of Mechanical and Systems Engineering; Hansung University; Seoul 136-792 Korea
| | - Sanghee Kim
- Department of Mechanical and Systems Engineering; Hansung University; Seoul 136-792 Korea
| | - Ae Rhan Kim
- Department of Chemistry; Chonbuk National University; Jeollabuk-do 561-756 Korea
| | - Dong Jin Yoo
- Department of Energy Storage and Conversion Engineering, Graduate School, Hydrogen and Fuel Cell Research Center; Chonbuk National University; Jeollabuk-do 561-756 Korea
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Anandha Ganesh P, Jeyakumar D. One pot aqueous synthesis of nanoporous Au85Pt15 material with surface bound Pt islands: an efficient methanol tolerant ORR catalyst. NANOSCALE 2014; 6:13012-13021. [PMID: 25241856 DOI: 10.1039/c4nr04712e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
For the first time, we are reporting the synthesis of Au100-xPtx nanoporous materials in the size range of 7-10 nm through the galvanic replacement of Ag by Pt from Au100-xAg2x spherical nano-alloys (x = 20, 15, 10 and 5) in an aqueous medium. The galvanic replacement reaction follows the 'Volmer-Weber' growth mode, resulting in the formation of surface bound platinum islands on a nanoporous gold surface. The high angle annular dark field image and low angle X-ray diffraction studies confirm the presence of nanoporous Au100-xPtx NPs. The electrochemical studies using the Au85Pt15/C catalyst show excellent methanol tolerance behaviour and better performance towards oxygen reduction reaction (ORR) in terms of high mass activity, mass-specific activity and figure of merit (FOM) when compared to HiSPEC Pt/C commercial catalyst. Preliminary studies on a full cell using nanoporous Au85Pt15/C (loading 1.0 mg cm(-2)) as the cathode material and Pt-Ru/C (loading: 0.5 mg cm(-2)) as the anode material performed better (38 mW cm(-2)) than the HiSPEC Pt/C cathode material (16 mW cm(-2)).
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Affiliation(s)
- P Anandha Ganesh
- Functional Materials Division, CSIR-Central Electrochemical Research Institute, Karaikkudi - 630006, Tamil Nadu, India.
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16
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Naseri N, Sangpour P, Mousavi SH. Applying alloyed metal nanoparticles to enhance solar assisted water splitting. RSC Adv 2014. [DOI: 10.1039/c4ra08216h] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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17
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Malathi S, Ezhilarasu T, Abiraman T, Balasubramanian S. One pot green synthesis of Ag, Au and Au-Ag alloy nanoparticles using isonicotinic acid hydrazide and starch. Carbohydr Polym 2014; 111:734-43. [PMID: 25037410 DOI: 10.1016/j.carbpol.2014.04.105] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Revised: 04/24/2014] [Accepted: 04/28/2014] [Indexed: 12/15/2022]
Abstract
Gold-silver alloy nanoparticles were synthesized via chemical reduction of varying mole fractions of chloroauric acid (HAuCl4) and silver nitrate (AgNO3) by environmentally benign isonicotinic acid hydrazide (INH) in the presence of starch as a capping agent in aqueous medium. The absorption spectra of Au-Ag nanoparticles show blue shift with increasing silver content indicating the formation of alloy nanoparticles. When the Ag content in the alloy decreases the size of the nanoparticles increases and as a result of which the oxidation potential also increases. The emission maximum undergoes a red shift from 443 to 614 nm. The nanoparticles are monodisperse and spherical with an average particle size of 3-18 nm. The catalytic behavior of alloy nanoparticles indicate that the rate constant for the reduction of 4-nitro phenol to 4-amino phenol increases exponentially from metallic Ag to metallic Au as Au content increases in the Au-Ag alloy nanoparticles.
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Affiliation(s)
- Sampath Malathi
- Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, Tamilnadu, India
| | - Tamilarasu Ezhilarasu
- Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, Tamilnadu, India
| | - Tamilselvan Abiraman
- Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, Tamilnadu, India
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Culbertson CT, Mickleburgh TG, Stewart-James SA, Sellens KA, Pressnall M. Micro total analysis systems: fundamental advances and biological applications. Anal Chem 2014; 86:95-118. [PMID: 24274655 PMCID: PMC3951881 DOI: 10.1021/ac403688g] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
| | - Tom G. Mickleburgh
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, USA
| | | | - Kathleen A. Sellens
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, USA
| | - Melissa Pressnall
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, USA
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