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Zhao S, Riedel M, Patarroyo J, Bastús NG, Puntes V, Yue Z, Lisdat F, Parak WJ. Tailoring of the photocatalytic activity of CeO 2 nanoparticles by the presence of plasmonic Ag nanoparticles. NANOSCALE 2022; 14:12048-12059. [PMID: 35946341 DOI: 10.1039/d2nr01318e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The present study investigates basic features of a photoelectrochemical system based on CeO2 nanoparticles fixed on gold electrodes. Since photocurrent generation is limited to the absorption range of the CeO2 in the UV range, the combination with metal nanoparticles has been studied. It can be shown that the combination of silver nanoparticles with the CeO2 can shift the excitation range into the visible light wavelength range. Here a close contact between both components has been found to be essential and thus, hybrid CeO2@Ag nanoparticles have been prepared and analyzed. We have collected arguments that electron transfer occurs between both compositional elements of the hybrid nanoparticles.The photocurrent generation can be rationalized on the basis of an energy diagram underlying the necessity of surface plasmon excitation in the metal nanoparticles, which is also supported by wavelength-dependent photocurrent measurements. However, electrochemical reactions seem to occur at the CeO2 surface and consequently, the catalytic properties of this material can be exploited as exemplified with the photoelectrochemical reduction of hydrogen peroxide. It can be further demonstrated that the layer-by layer technique can be exploited to create a multilayer system on top of a gold electrode which allows the adjustment of the sensitivity of the photoelectrochemical system. Thus, with a 5-layer electrode with hybrid CeO2@Ag nanoparticles submicromolar hydrogen peroxide concentrations can be detected.
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Affiliation(s)
- Shuang Zhao
- Fachbereich Physik, CHyN, Universität Hamburg, 22761 Hamburg, Germany.
| | - Marc Riedel
- Biosystems Technology, Institute of Life Sciences and Biomedical Technologies, Technical University of Applied Sciences Wildau, 15745 Wildau, Germany.
| | - Javier Patarroyo
- Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain
| | - Neus G Bastús
- Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain
| | - Victor Puntes
- Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain
- Vall d'Hebron Institut de Recerca (VHIR), 08035 Barcelona, Catalonia, Spain
- ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Catalonia, Spain
| | - Zhao Yue
- Department of Microelectronics, Nankai University, 30071 Tianjin, China.
| | - Fred Lisdat
- Biosystems Technology, Institute of Life Sciences and Biomedical Technologies, Technical University of Applied Sciences Wildau, 15745 Wildau, Germany.
| | - Wolfgang J Parak
- Fachbereich Physik, CHyN, Universität Hamburg, 22761 Hamburg, Germany.
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Nobile C, Cozzoli PD. Synthetic Approaches to Colloidal Nanocrystal Heterostructures Based on Metal and Metal-Oxide Materials. NANOMATERIALS 2022; 12:nano12101729. [PMID: 35630951 PMCID: PMC9147683 DOI: 10.3390/nano12101729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 04/30/2022] [Accepted: 05/09/2022] [Indexed: 12/04/2022]
Abstract
Composite inorganic nanoarchitectures, based on combinations of distinct materials, represent advanced solid-state constructs, where coexistence and synergistic interactions among nonhomologous optical, magnetic, chemical, and catalytic properties lay a basis for the engineering of enhanced or even unconventional functionalities. Such systems thus hold relevance for both theoretical and applied nanotechnology-based research in diverse areas, spanning optics, electronics, energy management, (photo)catalysis, biomedicine, and environmental remediation. Wet-chemical colloidal synthetic techniques have now been refined to the point of allowing the fabrication of solution free-standing and easily processable multicomponent nanocrystals with sophisticated modular heterostructure, built upon a programmed spatial distribution of the crystal phase, composition, and anchored surface moieties. Such last-generation breeds of nanocrystals are thus composed of nanoscale domains of different materials, assembled controllably into core/shell or heteromer-type configurations through bonding epitaxial heterojunctions. This review offers a critical overview of achievements made in the design and synthetic elaboration of colloidal nanocrystal heterostructures based on diverse associations of transition metals (with emphasis on plasmonic metals) and transition-metal oxides. Synthetic strategies, all leveraging on the basic seed-mediated approach, are described and discussed with reference to the most credited mechanisms underpinning regioselective heteroepitaxial deposition. The unique properties and advanced applications allowed by such brand-new nanomaterials are also mentioned.
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Affiliation(s)
- Concetta Nobile
- CNR NANOTEC—Institute of Nanotechnology, UOS di Lecce, c/o Campus Ecotekne, Via Monteroni, 73100 Lecce, Italy;
| | - Pantaleo Davide Cozzoli
- Department of Mathematics and Physics “Ennio De Giorgi”, c/o Campus Ecotekne, University of Salento, Via Monteroni, 73100 Lecce, Italy
- UdR INSTM di Lecce, c/o Campus Ecotekne, University of Salento, Via Arnesano, 73100 Lecce, Italy
- Correspondence:
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Bakuru VR, Fazl-Ur-Rahman K, Periyasamy G, Velaga B, Peela NR, DMello ME, Kanakikodi KS, Maradur SP, Maji TK, Kalidindi SB. Unraveling High Alkene Selectivity at Full Conversion in Alkyne Hydrogenation over Ni under Continuous Flow Conditions. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00875k] [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
Selective hydrogenation of alkynes into alkenes in continuous flow conditions over non-precious metal catalysts is an attractive prospect for the chemical industry, especially for the petrochemical and polymer industry. Achieving...
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Heterodimers of metal nanoparticles: synthesis, properties, and biological applications. Mikrochim Acta 2021; 188:345. [PMID: 34537870 DOI: 10.1007/s00604-021-05002-w] [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: 05/07/2021] [Accepted: 08/24/2021] [Indexed: 12/12/2022]
Abstract
Heterodimers of metal nanoparticles consist of two metals, come in many sizes and adopt various shapes. They offer unique properties due to the presence of two metals and have the extraordinary flexibility needed to serve as a multipurpose platform for diverse applications in areas including photonics, sensing, and catalysis. Heterodimer nanoparticles contain different metals that contribute to extraordinary surface plasmon resonance (SPR), surface-enhanced Raman scattering (SERS), and catalytic properties. These properties make them versatile molecules that can be used in intracellular imaging, as antibacterial agents, as photocatalytic and biological macromolecules and for the detection of chemical substances. Moreover, heterodimer nanoparticles are composed of the two metals within larger molecules that provide more choices for modification and application. In this review, we briefly summarize the lesser-known aspects of heterodimers, including some of their properties, and present concrete examples of recent progress in synthesis and applications. This review provides a perspective on achievements and suggests a framework for future research with a focus on the synthesis and application of heterodimers. We also explore the possible applications of heterodimer nanoparticles based on their unique properties.
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Ceria-Based Catalysts Studied by Near Ambient Pressure X-ray Photoelectron Spectroscopy: A Review. Catalysts 2020. [DOI: 10.3390/catal10030286] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The development of better catalysts is a passionate topic at the forefront of modern science, where operando techniques are necessary to identify the nature of the active sites. The surface of a solid catalyst is dynamic and dependent on the reaction environment and, therefore, the catalytic active sites may only be formed under specific reaction conditions and may not be stable either in air or under high vacuum conditions. The identification of the active sites and the understanding of their behaviour are essential information towards a rational catalyst design. One of the most powerful operando techniques for the study of active sites is near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS), which is particularly sensitive to the surface and sub-surface of solids. Here we review the use of NAP-XPS for the study of ceria-based catalysts, widely used in a large number of industrial processes due to their excellent oxygen storage capacity and well-established redox properties.
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Chen Y, Ning P, Miao R, Shi Y, He L, Guan Q. Selective hydrogenation of acetylene on the PdLa@N-doped biochar catalyst surface: the evolution of active sites, catalytic performance, and mechanism. NEW J CHEM 2020. [DOI: 10.1039/d0nj04401f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The high specific surface area of the support and the active site separation effect caused by the doping of La jointly promoted the high conversion rate of acetylene and the high selectivity of ethylene.
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Affiliation(s)
- Yao Chen
- Faculty of Environmental Science and Engineering
- Kunming University of Science and Technology
- Kunmin
- China
| | - Ping Ning
- Faculty of Environmental Science and Engineering
- Kunming University of Science and Technology
- Kunmin
- China
| | - Rongrong Miao
- Faculty of Environmental Science and Engineering
- Kunming University of Science and Technology
- Kunmin
- China
| | - Yuzhen Shi
- Faculty of Environmental Science and Engineering
- Kunming University of Science and Technology
- Kunmin
- China
| | - Liang He
- Faculty of Chemical Engineering
- Kunming University of Science and Technology
- Kunming, Yunnan 650500
- China
| | - Qingqing Guan
- Faculty of Civil Engineering and Mechanics
- Kunming University of Science and Technology
- Kunming
- China
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