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Abstract
Nucleation and growth are critical steps in crystallization, which plays an important role in determining crystal structure, size, morphology, and purity. Therefore, understanding the mechanisms of nucleation and growth is crucial to realize the controllable fabrication of crystalline products with desired and reproducible properties. Based on classical models, the initial crystal nucleus is formed by the spontaneous aggregation of ions, atoms, or molecules, and crystal growth is dependent on the monomer's diffusion and the surface reaction. Recently, numerous in situ investigations on crystallization dynamics have uncovered the existence of nonclassical mechanisms. This review provides a summary and highlights the in situ studies of crystal nucleation and growth, with a particular emphasis on the state-of-the-art research progress since the year 2016, and includes technological advances, atomic-scale observations, substrate- and temperature-dependent nucleation and growth, and the progress achieved in the various materials: metals, alloys, metallic compounds, colloids, and proteins. Finally, the forthcoming opportunities and challenges in this fascinating field are discussed.
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Affiliation(s)
- Junjie Li
- Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi830011, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing100049, China
| | - Francis Leonard Deepak
- Nanostructured Materials Group, International Iberian Nanotechnology Laboratory (INL), Av. Mestre Jose Veiga, 4715-330Braga, Portugal
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2
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Suresh RR, Kulandaisamy AJ, Nesakumar N, Nagarajan S, Lee JH, Rayappan JBB. Graphene Quantum Dots – Hydrothermal Green Synthesis, Material Characterization and Prospects for Cervical Cancer Diagnosis Applications: A Review. ChemistrySelect 2022. [DOI: 10.1002/slct.202200655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Raghavv Raghavender Suresh
- Department of Bioengineering School of Chemical & Biotechnology SASTRA Deemed University Thanjavur 613 401 Tamil Nadu India
- Centre for Nanotechnology & Advanced Biomaterials (CeNTAB) SASTRA Deemed University Thanjavur 613 401 Tamil Nadu India
| | - Arockia Jayalatha Kulandaisamy
- Centre for Nanotechnology & Advanced Biomaterials (CeNTAB) SASTRA Deemed University Thanjavur 613 401 Tamil Nadu India
- School of Electrical & Electronics Engineering SASTRA Deemed University Thanjavur 613 401 Tamil Nadu India
| | - Noel Nesakumar
- Department of Bioengineering School of Chemical & Biotechnology SASTRA Deemed University Thanjavur 613 401 Tamil Nadu India
- Centre for Nanotechnology & Advanced Biomaterials (CeNTAB) SASTRA Deemed University Thanjavur 613 401 Tamil Nadu India
| | - Saisubramanian Nagarajan
- Center for Research in Infectious Diseases (CRID) School of Chemical and Biotechnology SASTRA Deemed University Thanjavur 613 401 Tamil Nadu India
| | - Jung Heon Lee
- Research Center for Advanced Materials Technology School of Advanced Materials Science & Engineering Biomedical Institute for Convergence at SKKU (BICS) Sungkyunkwan University (SKKU) Suwon 16419 South Korea
| | - John Bosco Balaguru Rayappan
- Centre for Nanotechnology & Advanced Biomaterials (CeNTAB) SASTRA Deemed University Thanjavur 613 401 Tamil Nadu India
- School of Electrical & Electronics Engineering SASTRA Deemed University Thanjavur 613 401 Tamil Nadu India
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3
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Cappelletti C, Olaechea LM, Ianiro A, Prado-Martínez C, Oveisi E, Weder C, Schrettl S. Metallosupramolecular polymers as precursors for platinum nanocomposites. Polym Chem 2022; 13:1880-1890. [PMID: 35432604 PMCID: PMC8962995 DOI: 10.1039/d2py00071g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 03/04/2022] [Indexed: 11/21/2022]
Abstract
Nanocomposites comprised of a polymer matrix and metallic nanoparticles (NPs) can merge the structural features of the matrix material with the functional characteristics of the NPs. While such materials are...
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Affiliation(s)
- Claudio Cappelletti
- Adolphe Merkle Institute, University of Fribourg Chemin des Verdiers 4 1700 Fribourg Switzerland
| | - Luis M Olaechea
- Adolphe Merkle Institute, University of Fribourg Chemin des Verdiers 4 1700 Fribourg Switzerland
| | - Alessandro Ianiro
- Adolphe Merkle Institute, University of Fribourg Chemin des Verdiers 4 1700 Fribourg Switzerland
| | - Cristina Prado-Martínez
- Adolphe Merkle Institute, University of Fribourg Chemin des Verdiers 4 1700 Fribourg Switzerland
| | - Emad Oveisi
- Interdisciplinary Centre for Electron Microscopy, EPFL 1015 Lausanne Switzerland
| | - Christoph Weder
- Adolphe Merkle Institute, University of Fribourg Chemin des Verdiers 4 1700 Fribourg Switzerland
| | - Stephen Schrettl
- Adolphe Merkle Institute, University of Fribourg Chemin des Verdiers 4 1700 Fribourg Switzerland
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4
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Wang J, Yin C, Han W, Ma Y, Yin Y, Zhao P, Song Y, Zhang J. One-pot synthesis of Au-based nanocrystals via a platinum group metal anion controlled growth strategy in citrate medium. NEW J CHEM 2022. [DOI: 10.1039/d1nj05397c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Finding a facile manufacturing method of Au-based low PGM content nanocrystals by exploring the reaction process of a series of PGM anions with the in situ Au NW templates.
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Affiliation(s)
- Jin Wang
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China
- Heze Branch, Qilu University of Technology (Shandong Academy of Sciences), Biological Engineering Technology Innovation Center of Shandong Province, Heze, 274000, P. R. China
| | - Chong Yin
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China
- Heze Branch, Qilu University of Technology (Shandong Academy of Sciences), Biological Engineering Technology Innovation Center of Shandong Province, Heze, 274000, P. R. China
| | - Wenjia Han
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China
| | - Yaohong Ma
- Shandong Provincial Key Laboratory of Biosensors, Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), No. 28789, Jingshi East Road, Licheng District, Jinan, Shandong, 250103, China
| | - Yanchao Yin
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China
- Heze Branch, Qilu University of Technology (Shandong Academy of Sciences), Biological Engineering Technology Innovation Center of Shandong Province, Heze, 274000, P. R. China
| | - Peiyu Zhao
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China
- Heze Branch, Qilu University of Technology (Shandong Academy of Sciences), Biological Engineering Technology Innovation Center of Shandong Province, Heze, 274000, P. R. China
| | - Yahui Song
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China
| | - Jihui Zhang
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China
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5
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Platinum Based Nanoparticles Produced by a Pulsed Spark Discharge as a Promising Material for Gas Sensors. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11020526] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
We have applied spark ablation technology for producing nanoparticles from platinum ingots (purity of 99.97 wt. %) as a feed material by using air as a carrier gas. A maximum production rate of about 400 mg/h was achieved with an energy per pulse of 0.5 J and a pulse repetition rate of 250 Hz. The synthesized nanomaterial, composed of an amorphous platinum oxide PtO (83 wt. %) and a crystalline metallic platinum (17 wt. %), was used for formulating functional colloidal ink. Annealing of the deposited ink at 750 °C resulted in the formation of a polycrystalline material comprising 99.7 wt. % of platinum. To demonstrate the possibility of application of the formulated ink in printed electronics, we have patterned conductive lines and microheaters on alumina substrates and 20 μm thick low-temperature co-fired ceramic (LTCC) membranes with the use of aerosol jet printing technology. The power consumption of microheaters fabricated on LTCC membranes was found to be about 140 mW at a temperature of the hot part of 500 °C, thus allowing one to consider these structures as promising micro-hotplates for metal oxide semiconductor (MOS) gas sensors. The catalytic activity of the synthesized nanoparticles was demonstrated by measuring the resistance transients of the non-sintered microheaters upon exposure to 2500 ppm of hydrogen.
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Quinson J, Jensen KM. From platinum atoms in molecules to colloidal nanoparticles: A review on reduction, nucleation and growth mechanisms. Adv Colloid Interface Sci 2020; 286:102300. [PMID: 33166723 DOI: 10.1016/j.cis.2020.102300] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 10/25/2020] [Accepted: 10/26/2020] [Indexed: 12/24/2022]
Abstract
Platinum (Pt) is one of the most studied materials in catalysis today and considered for a wide range of applications: chemical synthesis, energy conversion, air treatment, water purification, sensing, medicine etc. As a limited and non-renewable resource, optimized used of Pt is key. Nanomaterial design offers multiple opportunities to make the most of Pt resources down to the atomic scale. In particular, colloidal syntheses of Pt nanoparticles are well documented and simple to implement, which accounts for the large interest in research and development. For further breakthroughs in the design of Pt nanomaterials, a deeper understanding of the intricate synthesis-structures-properties relations of Pt nanoparticles must be obtained. Understanding how Pt nanoparticles form from molecular precursors is both a challenging and rewarding area of investigation. It is directly relevant to develop improved Pt nanomaterials but is also a source of inspiration to design other precious metal nanostructures. Here, we review the current understanding of Pt nanoparticle formation. This review is aimed at readers with interest in Pt nanoparticles in general and their colloidal syntheses in particular. Readers with a strongest interest on the study of nanomaterial formation will find here the case study of Pt. The preferred model systems and characterization techniques used to perform the study of Pt nanoparticle syntheses are discussed. In light of recent achievements, further direction and areas of research are proposed.
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Olaechea LM, Montero de Espinosa L, Oveisi E, Balog S, Sutton P, Schrettl S, Weder C. Spatially Resolved Production of Platinum Nanoparticles in Metallosupramolecular Polymers. J Am Chem Soc 2019; 142:342-348. [DOI: 10.1021/jacs.9b10685] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luis M. Olaechea
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
| | | | - Emad Oveisi
- Interdisciplinary Centre for Electron Microscopy, EPFL, 1015 Lausanne, Switzerland
| | - Sandor Balog
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
| | - Preston Sutton
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
| | - Stephen Schrettl
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
| | - Christoph Weder
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
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8
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Shultz LR, Hu L, Preradovic K, Beazley MJ, Feng X, Jurca T. A Broader‐scope Analysis of the Catalytic Reduction of Nitrophenols and Azo Dyes with Noble Metal Nanoparticles. ChemCatChem 2019. [DOI: 10.1002/cctc.201900260] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Lorianne R. Shultz
- Department of ChemistryUniversity of Central Florida Orlando, Florida 32816 USA
| | - Lin Hu
- Department of Materials Science and EngineeringUniversity of Central Florida Orlando, Florida 32816 USA
| | | | - Melanie J. Beazley
- Department of ChemistryUniversity of Central Florida Orlando, Florida 32816 USA
| | - Xiaofeng Feng
- Department of Materials Science and EngineeringUniversity of Central Florida Orlando, Florida 32816 USA
- Department of PhysicsUniversity of Central Florida Orlando, Florida 32816 USA
- Renewable Energy and Chemical Transformations ClusterUniversity of Central Florida Orlando, Florida 32816 USA
| | - Titel Jurca
- Department of ChemistryUniversity of Central Florida Orlando, Florida 32816 USA
- Renewable Energy and Chemical Transformations ClusterUniversity of Central Florida Orlando, Florida 32816 USA
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Destro P, Cantaneo DA, Meira DM, dos Santos Honório G, da Costa LS, Bueno JMC, Zanchet D. Formation of Bimetallic Copper–Gold Alloy Nanoparticles Probed by in Situ X‐ray Absorption Fine Structure Spectroscopy. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800413] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Priscila Destro
- Institute of Chemistry University of Campinas P.O. Box 6154 13083‐970 Campinas SP Brazil
| | | | - Débora M. Meira
- Department of Chemical Engineering Federal University of São Carlos P.O. Box 676 13565‐905 São Carlos SP Brazil
| | | | - Luelc Souza da Costa
- Institute of Chemistry University of Campinas P.O. Box 6154 13083‐970 Campinas SP Brazil
| | - José Maria C. Bueno
- Department of Chemical Engineering Federal University of São Carlos P.O. Box 676 13565‐905 São Carlos SP Brazil
| | - Daniela Zanchet
- Institute of Chemistry University of Campinas P.O. Box 6154 13083‐970 Campinas SP Brazil
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10
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Nayak C, Bhattacharyya D, Jha SN, Sahoo NK. In Situ XAS Study on Growth of PVP-Stabilized Cu Nanoparticles. ChemistrySelect 2018. [DOI: 10.1002/slct.201801358] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Chandrani Nayak
- Atomic & Molecular Physics Division; Bhabha Atomic Research Centre; Mumbai - 400 085 India
- Homi Bhabha National Institute, Anushaktinagar; Mumbai- 400096 India
| | - Dibyendu Bhattacharyya
- Atomic & Molecular Physics Division; Bhabha Atomic Research Centre; Mumbai - 400 085 India
- Homi Bhabha National Institute, Anushaktinagar; Mumbai- 400096 India
| | - Shambhu N. Jha
- Atomic & Molecular Physics Division; Bhabha Atomic Research Centre; Mumbai - 400 085 India
- Homi Bhabha National Institute, Anushaktinagar; Mumbai- 400096 India
| | - Naba K. Sahoo
- Atomic & Molecular Physics Division; Bhabha Atomic Research Centre; Mumbai - 400 085 India
- Homi Bhabha National Institute, Anushaktinagar; Mumbai- 400096 India
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11
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El-Sayed HA, Burger VM, Miller M, Wagenbauer K, Wagenhofer M, Gasteiger HA. Ionic Conductivity Measurements-A Powerful Tool for Monitoring Polyol Reduction Reactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:13615-13624. [PMID: 29083194 DOI: 10.1021/acs.langmuir.7b03444] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The reduction of metal precursors during the polyol synthesis of metal nanoparticles was monitored by ex situ ionic conductivity measurements. Using commonly used platinum precursors (K2PtCl6, H2PtCl6, and K2PtCl4) as well as iridium and ruthenium precursors (IrCl3 and RuCl3), we demonstrate that their reduction in ethylene glycol at elevated temperatures is accompanied by a predictable change in ionic conductivity, enabling a precise quantification of the onset temperature for their reduction. This method also allows detecting the onset temperature for the further reaction of ethylene glycol with HCl produced by the reduction of chloride-containing metal precursors (at ≈120 °C). On the basis of these findings, we show that the conversion of the metal precursor to reduced metal atoms/clusters can be precisely quantified, if the reaction occurs below 120 °C, which also enables a distinction between the stages of metal particle nucleation and growth. The latter is demonstrated by the reduction of H2PtCl6 in ethylene glycol, comparing ionic conductivity measurements with transmission electron microscopy analysis. In summary, ionic conductivity measurements are a simple and straightforward tool to quantify the reduction kinetics of commonly used metal precursors in the polyol synthesis.
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Affiliation(s)
| | | | | | - Klaus Wagenbauer
- Walter Schottky Institut, Technical University of Munich , Am Coulombwall 4, D-85748 Garching, Germany
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12
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Nayak C, Bhattacharyya D, Bhattacharyya K, Tripathi AK, Bapat RD, Jha SN, Sahoo NK. Insight into growth of Au-Pt bimetallic nanoparticles: an in situ XAS study. JOURNAL OF SYNCHROTRON RADIATION 2017; 24:825-835. [PMID: 28664890 DOI: 10.1107/s1600577517006257] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 04/25/2017] [Indexed: 05/03/2023]
Abstract
Au-Pt bimetallic nanoparticles have been synthesized through a one-pot synthesis route from their respective chloride precursors using block copolymer as a stabilizer. Growth of the nanoparticles has been studied by simultaneous in situ measurement of X-ray absorption spectroscopy (XAS) and UV-Vis spectroscopy at the energy-dispersive EXAFS beamline (BL-08) at Indus-2 SRS at RRCAT, Indore, India. In situ XAS spectra, comprising both X-ray near-edge structure (XANES) and extended X-ray absorption fine-structure (EXAFS) parts, have been measured simultaneously at the Au and Pt L3-edges. While the XANES spectra of the precursors provide real-time information on the reduction process, the EXAFS spectra reveal the structure of the clusters formed in the intermediate stages of growth. This insight into the formation process throws light on how the difference in the reduction potential of the two precursors could be used to obtain the core-shell-type configuration of a bimetallic alloy in a one-pot synthesis method. The core-shell-type structure of the nanoparticles has also been confirmed by ex situ energy-dispersive spectroscopy line-scan and X-ray photoelectron spectroscopy measurements with in situ ion etching on fully formed nanoparticles.
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Affiliation(s)
- Chandrani Nayak
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - D Bhattacharyya
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - K Bhattacharyya
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - A K Tripathi
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - R D Bapat
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai 400005, India
| | - S N Jha
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - N K Sahoo
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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13
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Boita J, Nicolao L, Alves MCM, Morais J. Controlled growth of metallic copper nanoparticles. NEW J CHEM 2017. [DOI: 10.1039/c7nj03056h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
We report a polyol synthesis method that provides controlled growth of chemically stable Cu nanoparticles with mean diameter easily tuned to lie below 10 nm.
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Affiliation(s)
- Jocenir Boita
- Laboratório de Espectroscopia de Elétrons (LEe-)
- Instituto de Física
- Universidade Federal do Rio Grande do Sul (UFRGS)
- Porto Alegre
- Brazil
| | - Lucas Nicolao
- Laboratório de Espectroscopia de Elétrons (LEe-)
- Instituto de Física
- Universidade Federal do Rio Grande do Sul (UFRGS)
- Porto Alegre
- Brazil
| | - Maria C. M. Alves
- Laboratório de Espectroscopia de Elétrons (LEe-)
- Instituto de Física
- Universidade Federal do Rio Grande do Sul (UFRGS)
- Porto Alegre
- Brazil
| | - Jonder Morais
- Laboratório de Espectroscopia de Elétrons (LEe-)
- Instituto de Física
- Universidade Federal do Rio Grande do Sul (UFRGS)
- Porto Alegre
- Brazil
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14
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Xian L, Engelbrecht L, Barkhuysen S, Koch KR. Room temperature photo-induced deposition of platinum mirrors and nano-layers from simple Pt(ii) precursor complexes in water–methanol solutions. RSC Adv 2016. [DOI: 10.1039/c6ra03318k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Mirror-like nano-layers of variable thicknesses can be deposited directly onto FTO glass at room temperature under continuous irradiation with polychromatic light from water/methanol solutions containing low concentrations of [PtCl4]2−.
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Affiliation(s)
- Liang Xian
- Department of Chemistry and Polymer Science
- Stellenbosch University
- South Africa
| | - Leon Engelbrecht
- Department of Chemistry and Polymer Science
- Stellenbosch University
- South Africa
| | - Shani Barkhuysen
- Department of Chemistry and Polymer Science
- Stellenbosch University
- South Africa
| | - Klaus R. Koch
- Department of Chemistry and Polymer Science
- Stellenbosch University
- South Africa
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15
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Nayak C, Bhattacharyya D, Jha SN, Sahoo NK. Growth of block copolymer stabilized metal nanoparticles probed simultaneously by in situ XAS and UV-Vis spectroscopy. JOURNAL OF SYNCHROTRON RADIATION 2016; 23:293-303. [PMID: 26698077 DOI: 10.1107/s1600577515022122] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 11/19/2015] [Indexed: 06/05/2023]
Abstract
The growth of Au and Pt nanoparticles from their respective chloride precursors using block copolymer-based reducers has been studied by simultaneous in situ measurement of XAS and UV-Vis spectroscopy at the energy-dispersive EXAFS beamline (BL-08) at INDUS-2 SRS at RRCAT, Indore, India. While the XANES spectra of the precursor give real-time information on the reduction process, the EXAFS spectra reveal the structure of the clusters formed at the intermediate stages of growth. The growth kinetics of both types of nanoparticles are found to be almost similar and are found to follow three stages, though the first stage of nucleation takes place earlier in the case of Au than in the case of Pt nanoparticles due to the difference in the reduction potential of the respective precursors. The first two stages of the growth of Au and Pt nanoparticles as obtained by in situ XAS measurements could be corroborated by simultaneous in situ measurement of UV-Vis spectroscopy also.
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Affiliation(s)
- C Nayak
- Bhabha Atomic Research Centre, Mumbai 400 085, India
| | | | - S N Jha
- Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - N K Sahoo
- Bhabha Atomic Research Centre, Mumbai 400 085, India
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16
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Carey JL, Whitcomb DR, Chen S, Penn RL, Bühlmann P. Potentiometric in Situ Monitoring of Anions in the Synthesis of Copper and Silver Nanoparticles Using the Polyol Process. ACS NANO 2015; 9:12104-12114. [PMID: 26580413 DOI: 10.1021/acsnano.5b05170] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Potentiometric sensors, such as polymeric membrane, ion-selective electrodes (ISEs), have been used in the past to monitor a variety of chemical processes. However, the use of these sensors has traditionally been limited to aqueous solutions and moderate temperatures. Here we present an ISE with a high-capacity ion-exchange sensing membrane for measurements of nitrate and nitrite in the organic solvent propylene glycol at 150 °C. It is capable of continuously measuring under these conditions for over 180 h. We demonstrate the usefulness of this sensor by in situ monitoring of anion concentrations during the synthesis of copper and silver nanoparticles in propylene glycol using the polyol method. Ion chromatography and a colorimetric method were used to independently confirm anion concentrations measured in situ. In doing so, it was shown that in this reaction the co-ion nitrate is reduced to nitrite.
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Affiliation(s)
- Jesse L Carey
- Department of Chemistry, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - David R Whitcomb
- Carestream Health , 1 Imation Way, Oakdale, Minnesota 55128, United States
| | - Suyue Chen
- Department of Chemistry, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - R Lee Penn
- Department of Chemistry, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Philippe Bühlmann
- Department of Chemistry, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
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Boita J, Castegnaro MV, Alves MDCM, Morais J. A dispenser-reactor apparatus applied for in situ XAS monitoring of Pt nanoparticle formation. JOURNAL OF SYNCHROTRON RADIATION 2015; 22:736-744. [PMID: 25931091 DOI: 10.1107/s1600577515003434] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Accepted: 02/18/2015] [Indexed: 06/04/2023]
Abstract
In situ time-resolved X-ray absorption spectroscopy (XAS) measurements collected at the Pt L3-edge during the synthesis of Pt nanoparticles (NPs) in aqueous solution are reported. A specially designed dispenser-reactor apparatus allowed for monitoring changes in the XAS spectra from the earliest moments of Pt ions in solution until the formation of metallic nanoparticles with a mean diameter of 4.9 ± 1.1 nm. By monitoring the changes in the local chemical environment of the Pt atoms in real time, it was possible to observe that the NPs formation kinetics involved two stages: a reduction-nucleation burst followed by a slow growth and stabilization of NPs. Subsequently, the synthesized Pt NPs were supported on activated carbon and characterized by synchrotron-radiation-excited X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS). The supported Pt NPs remained in the metallic chemical state and with a reduced size, presenting slight lattice parameter contraction in comparison with the bulk Pt values.
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Affiliation(s)
- Jocenir Boita
- Laboratório de Espectroscopia de Elétrons (LEe-), Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, CEP-91501-970, Porto Alegre, Rio Grande do Sul - RS 15051, Brazil
| | - Marcus Vinicius Castegnaro
- Laboratório de Espectroscopia de Elétrons (LEe-), Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, CEP-91501-970, Porto Alegre, Rio Grande do Sul - RS 15051, Brazil
| | - Maria do Carmo Martins Alves
- Instituto de Química, Universidde Federal do Rio Grande do Sul (UFRGS), Av. Bento Gaonçalves 9500, CEP-91501-970, Porto Alegre, Rio Grande do Sul - RS 15003, Brazil
| | - Jonder Morais
- Laboratório de Espectroscopia de Elétrons (LEe-), Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, CEP-91501-970, Porto Alegre, Rio Grande do Sul - RS 15051, Brazil
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