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Zinzani S, Baletto F. Coalescence of AuPd nanoalloys in implicit environments. Phys Chem Chem Phys 2024. [PMID: 38963293 DOI: 10.1039/d4cp00916a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/05/2024]
Abstract
The optimal design of nanoparticles and nanoalloys arises from the control of their morphology which depends on the synthesis process they undergo. Coalescence is widely accepted as one of the most common synthetic mechanisms, and it occurs both in the liquid and gas phases. Coalescence is when two existing seeds collide and aggregate into a larger object. The resulting aggregate is expected to be far from the equilibrium isomer, i.e. the global minimum of the potential energy surface. While the coalescence of nanoparticles is well studied in a vacuum, sparse computational studies are available for the coalescence in an environment. Using molecular dynamics simulations, we study the coalescence of Au and Pd nanoseeds surrounded by an interacting environment. Comparing the initial stages of the coalescence in a vacuum and the presence of an interacting environment, we show that the formation kinetics strongly depends on the environment and on the size of the nanoalloy. Furthermore, we show that it is possible to tune the resulting nanoalloys' surface chemical composition by changing their surrounding environment.
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Affiliation(s)
- Sofia Zinzani
- Università degli Studi di Milano - Dipartimento di Fisica, Via Celoria 16, Milano I-20133, Italy.
| | - Francesca Baletto
- Università degli Studi di Milano - Dipartimento di Fisica, Via Celoria 16, Milano I-20133, Italy.
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2
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Guo F, Liu Y, Zhang M, Yu W, Li S, Zhang B, Hu B, Zhong L, Jie W, Hao L. A Dual-Functional Integration of Photodetectors and Artificial Optoelectronic Synapses on a VO 2/WO 3 Heterojunction Device. SMALL METHODS 2024:e2400779. [PMID: 38940078 DOI: 10.1002/smtd.202400779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2024] [Revised: 06/18/2024] [Indexed: 06/29/2024]
Abstract
Bionic visual systems require multimodal integration of eye-like photodetectors and brain-like image memory. However, the integration of photodetectors (PDs) and artificial optoelectronic synapses devices (OESDs) by one device remains a giant challenge due to their photoresponse discrepancy. Herein, a dual-functional integration of PDs and OESDs based on VO2/WO3 heterojunctions is presented. The device can be able to realize a dual-mode conversion between PDs and OESDs through tuning the bias voltage. Under zero bias voltage, the device exhibiting excellent photodetecting behaviors based on the photovoltaic effect, showing a high self-powered photoresponsivity of 18.5 mA W-1 and high detectivity of 7.5 × 1010 Jones with fast photoresponse. When the external bias voltages are applied, it can be acted as an OESD and exhibit versatile electrical and photonic synaptic characteristics based on the trapping and detrapping effects, including synaptic plasticity and learning-experience behaviors. More importantly, benefiting from the excellent photosensing ability and transporting properties, the device shows ultralow-power consumption of 39.0 pJ and a 4 × 4 OESDs array is developed to realize the visual perception and memory. This work not only supplies a novel route to realize complex functional integration just in one device, but also offers effective strategies for developing neuromorphic visual system.
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Affiliation(s)
- Fuhai Guo
- College of Science, China University of Petroleum, Qingdao, Shandong, 266580, China
- School of Materials Science and Engineering, China University of Petroleum, Qingdao, Shandong, 266580, China
| | - Yunjie Liu
- College of Science, China University of Petroleum, Qingdao, Shandong, 266580, China
| | - Mingcong Zhang
- School of Materials Science and Engineering, China University of Petroleum, Qingdao, Shandong, 266580, China
| | - Weizhuo Yu
- School of Materials Science and Engineering, China University of Petroleum, Qingdao, Shandong, 266580, China
| | - Siqi Li
- School of Materials Science and Engineering, China University of Petroleum, Qingdao, Shandong, 266580, China
| | - Bo Zhang
- School of Materials Science and Engineering, China University of Petroleum, Qingdao, Shandong, 266580, China
| | - Bing Hu
- School of Materials Science and Engineering, China University of Petroleum, Qingdao, Shandong, 266580, China
| | - Lun Zhong
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Wenjing Jie
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Lanzhong Hao
- School of Materials Science and Engineering, China University of Petroleum, Qingdao, Shandong, 266580, China
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3
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Pang Y, Li H, Hua Y, Zhang X, Di L. Rapid Synthesis of Noble Metal Colloids by Plasma-Liquid Interactions. MATERIALS (BASEL, SWITZERLAND) 2024; 17:987. [PMID: 38473460 DOI: 10.3390/ma17050987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 02/03/2024] [Accepted: 02/19/2024] [Indexed: 03/14/2024]
Abstract
The interactions between plasma and liquids cause complex physical and chemical reactions at the gas-liquid contact surface, producing numerous chemically active particles that can rapidly reduce noble metal ions. This study uses atmospheric-pressure surface dielectric barrier discharge (DBD) plasma to treat ethanol aqueous solutions containing noble metal precursors, and stable gold, platinum, and palladium colloids are obtained within a few minutes. To evaluate the mechanism of the reduction of noble metal precursors by atmospheric-pressure surface DBD plasma, the corresponding metal colloids are prepared first by activating an ethanol aqueous solution with plasma and then adding noble metal precursors. It is found that the long-lived active species hydrogen peroxide (H2O2) plays a dominant role in the synthesis process, which has distinct effects on different metal ions. When HAuCl4 and H2PdCl4 are used as precursors, H2O2 acts as a reducing agent, and AuCl4- and PdCl42- ions can be reduced to metallic Au and Pd. However, when AgNO3 is the precursor, H2O2 acts as an oxidising agent, and Ag+ ions cannot be reduced to obtain metal colloids because metallic Ag can be dissolved in H2O2 under acidic conditions. A similar phenomenon was also observed for the preparation of Pd colloid-PA with a plasma-activated ethanol aqueous solution using Pd(NO3)2 as a Pd precursor.
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Affiliation(s)
- Yuanwen Pang
- College of Physical Science and Technology, Dalian University, Dalian 116622, China
| | - Hong Li
- College of Physical Science and Technology, Dalian University, Dalian 116622, China
| | - Yue Hua
- College of Physical Science and Technology, Dalian University, Dalian 116622, China
| | - Xiuling Zhang
- College of Physical Science and Technology, Dalian University, Dalian 116622, China
| | - Lanbo Di
- College of Physical Science and Technology, Dalian University, Dalian 116622, China
- State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
- Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province, Dalian University of Technology, Dalian 116024, China
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4
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Dall’Osto G, Marsili M, Vanzan M, Toffoli D, Stener M, Corni S, Coccia E. Peeking into the Femtosecond Hot-Carrier Dynamics Reveals Unexpected Mechanisms in Plasmonic Photocatalysis. J Am Chem Soc 2024; 146:2208-2218. [PMID: 38199967 PMCID: PMC10811681 DOI: 10.1021/jacs.3c12470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 12/23/2023] [Accepted: 12/29/2023] [Indexed: 01/12/2024]
Abstract
Plasmonic-driven photocatalysis may lead to reaction selectivity that cannot be otherwise achieved. A fundamental role is played by hot carriers, i.e., electrons and holes generated upon plasmonic decay within the metal nanostructure interacting with molecular species. Understanding the elusive microscopic mechanism behind such selectivity is a key step in the rational design of hot-carrier reactions. To accomplish that, we present state-of-the-art multiscale simulations, going beyond density functional theory, of hot-carrier injections for the rate-determining step of a photocatalytic reaction. We focus on carbon dioxide reduction, for which it was experimentally shown that the presence of a rhodium nanocube under illumination leads to the selective production of methane against carbon monoxide. We show that selectivity is due to a (predominantly) direct hole injection from rhodium to the reaction intermediate CHO. Unexpectedly, such an injection does not promote the selective reaction path by favoring proper bond breaking but rather by promoting bonding of the proper molecular fragment to the surface.
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Affiliation(s)
- Giulia Dall’Osto
- Dipartimento
di Scienze Chimiche, Università di
Padova, via F. Marzolo 1, 35131 Padova, Italy
| | - Margherita Marsili
- Dipartimento
di Fisica e Astronomia “Augusto Righi”, University of Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy
| | - Mirko Vanzan
- Dipartimento
di Scienze Chimiche, Università di
Padova, via F. Marzolo 1, 35131 Padova, Italy
- Dipartimento
di Fisica, University of Milan, Via Giovanni Celoria 16, 20133 Milano, Italy
| | - Daniele Toffoli
- Dipartimento
di Scienze Chimiche e Farmaceutiche, University
of Trieste, via L. Giorgieri 1, 34127 Trieste, Italy
| | - Mauro Stener
- Dipartimento
di Scienze Chimiche e Farmaceutiche, University
of Trieste, via L. Giorgieri 1, 34127 Trieste, Italy
| | - Stefano Corni
- Dipartimento
di Scienze Chimiche, Università di
Padova, via F. Marzolo 1, 35131 Padova, Italy
- Istituto
Nanoscienze-CNR, via
Campi 213/A, 41125 Modena, Italy
| | - Emanuele Coccia
- Dipartimento
di Scienze Chimiche e Farmaceutiche, University
of Trieste, via L. Giorgieri 1, 34127 Trieste, Italy
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Wakabayashi S, Oh Y, Nakayama H, Wang J, Kiwa T. Ultrathin Platinum Film Hydrogen Sensors with a Twin-T Type Notch Filter Circuit. SENSORS (BASEL, SWITZERLAND) 2024; 24:548. [PMID: 38257641 PMCID: PMC10819346 DOI: 10.3390/s24020548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 12/31/2023] [Accepted: 01/12/2024] [Indexed: 01/24/2024]
Abstract
In recent years, hydrogen energy has garnered attention as a potential solution for mitigating greenhouse gas emissions. However, concerns regarding the inherent risk of hydrogen gas leakage and potential explosions have necessitated the development of advanced sensors. Within our research group, we have innovated an ultrathin platinum (Pt) film hydrogen sensor that gauges resistance changes in Pt thin films when exposed to hydrogen gas. Notably, the sensitivity of each sensor is contingent upon the thickness of the Pt film. To address the challenge of detecting hydrogen using multiple sensors, we integrated the ultrathin Pt film as a resistance element within a twin-T type notch filter. This filter exhibits a distinctive reduction in output signals at a specific frequency. The frequency properties of the notch filter dynamically alter with changes in the resistance of the Pt film induced by hydrogen exposure. Consequently, the ultrathin Pt film hydrogen sensor monitors output signal variations around the notch frequency, responding to shifts in frequency properties. This innovative approach enables the electrical control of sensor sensitivity by adjusting the operating frequency in proximity to the notch frequency. Additionally, the simultaneous detection of hydrogen by multiple sensors was successfully achieved by interconnecting sensors with distinct notch frequencies in series.
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Affiliation(s)
| | | | | | | | - Toshihiko Kiwa
- Graduate School of Interdisciplinary Science and Engineering in Health Systems, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan; (S.W.); (Y.O.); (H.N.); (J.W.)
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Chi L, Zhang C, Wu X, Qian X, Sun H, He M, Guo C. Research Progress on Biomimetic Nanomaterials for Electrochemical Glucose Sensors. Biomimetics (Basel) 2023; 8:biomimetics8020167. [PMID: 37092419 PMCID: PMC10123724 DOI: 10.3390/biomimetics8020167] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Revised: 04/16/2023] [Accepted: 04/17/2023] [Indexed: 04/25/2023] Open
Abstract
Diabetes has become a chronic disease that necessitates timely and accurate detection. Among various detection methods, electrochemical glucose sensors have attracted much attention because of low cost, real-time detection, and simple and easy operation. Nonenzymatic biomimetic nanomaterials are the vital part in electrochemical glucose sensors. This review article summarizes the methods to enhance the glucose sensing performance of noble metal, transition metal oxides, and carbon-based materials and introduces biomimetic nanomaterials used in noninvasive glucose detection in sweat, tear, urine, and saliva. Based on these, this review provides the foundation for noninvasive determination of trace glucose for diabetic patients in the future.
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Affiliation(s)
- Lili Chi
- School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Chunmei Zhang
- School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Xuanyu Wu
- School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Xianghao Qian
- School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Hao Sun
- School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Mengru He
- School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Chunxian Guo
- School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
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Colusso E, Rigon M, Corso AJ, Pelizzo MG, Martucci A. Optical Hydrogen Sensing Properties of e-Beam WO 3 Films Decorated with Gold Nanoparticles. SENSORS (BASEL, SWITZERLAND) 2023; 23:1936. [PMID: 36850533 PMCID: PMC9958985 DOI: 10.3390/s23041936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 02/02/2023] [Accepted: 02/07/2023] [Indexed: 06/18/2023]
Abstract
Tungsten oxide thin films with different thicknesses, crystallinity and morphology were synthesized by e-beam deposition followed by thermal treatment and acid boiling. The films with different surface morphologies were coated with gold nanoparticles and tested as optical sensing materials towards hydrogen. X-ray diffraction, scanning electron microscopy, ellipsometry and UV-VIS spectroscopy were employed to characterize the structural, morphological and optical properties of the film. We demonstrated a good response towards hydrogen in air, reaching a good selectivity among other common reducing gases, such as ammonia and carbon monoxide. The sensitivity has been proven to be highly dependent on the thickness and crystallinity of the samples.
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Affiliation(s)
- Elena Colusso
- Department of Industrial Engineering, University of Padova & INSTM, Via Marzolo 9, 35131 Padova, Italy
| | - Michele Rigon
- Department of Industrial Engineering, University of Padova & INSTM, Via Marzolo 9, 35131 Padova, Italy
| | - Alain Jody Corso
- CNR—Istituto di Fotonica e Nanotecnologie, Via Trasea 7, 35131 Padova, Italy
| | | | - Alessandro Martucci
- Department of Industrial Engineering, University of Padova & INSTM, Via Marzolo 9, 35131 Padova, Italy
- CNR—Istituto di Fotonica e Nanotecnologie, Via Trasea 7, 35131 Padova, Italy
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