1
|
Ma J, Jin X, Yang M, Zhao X, Ding S, Wang B, Li X. Fabrication of 2D/1D Bi 2WO 6/halloysite nanotubes photocatalyst towards water purification: a support effect on in situconstruction and electron-hole separation. NANOTECHNOLOGY 2023; 34:475701. [PMID: 37591213 DOI: 10.1088/1361-6528/acf139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 08/16/2023] [Indexed: 08/19/2023]
Abstract
In this research work, a reusable and efficient 2D/1D heterogeneous structured photocatalyst based on amine-functionalized halloysite nanotubes (MHNTs) and Bi2WO6nanosheet (BWO) was prepared using a facile hydrothermal method for decomposing PPCPs under simulated sunlight. On the degradation of tetracycline hydrochloride (TCH), the effects of composite catalysts prepared under various conditions were discussed. The results showed that over BWO/MHNTs with a mass ratio was 3:1, the synthesizing temperature was 120 °C and the precursor pH value was 1, the TCH (10 mg l-1) degradation efficiency reached 100% after 1 h irradiation of simulated sunlight. Moreover, BWO/MHNTs composites kept good recovery and stable photocatalytic activity after 5 cycles. The excellent dispersion of Bi2WO6on the surface of clay minerals and the oxygen vacancy enhanced electron-hole separation may be responsible for the its high activity and stability. Futhermore, the radical capture test demonstrated that ·O-2was primarily responsible for the photodegradation of TCH. Thus, BWO/MHNTs composites exhibit a good application prospect in the field of sunlight-driven photocatalytic degradation towards PPCPs pollutants in water.
Collapse
Affiliation(s)
- Jiayu Ma
- School of Materials Design and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, People's Republic of China
| | - Xu Jin
- School of Materials Design and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, People's Republic of China
| | - Mengjuan Yang
- School of Materials Design and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, People's Republic of China
| | - Ximeng Zhao
- School of Materials Design and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, People's Republic of China
| | - Shanshan Ding
- School of Materials Design and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, People's Republic of China
| | - Bin Wang
- School of Materials Design and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, People's Republic of China
- Beijing Key Laboratory of Clothing Materials R and D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, Beijing Institute of Fashion Technology, Beijing 100029, People's Republic of China
| | - Xiuyan Li
- School of Materials Design and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, People's Republic of China
| |
Collapse
|
2
|
Shao Z, Cheng J, Zhang Y, Peng Y, Shi L, Zhong M. Comprehension of the Synergistic Effect between m&t-BiVO 4/TiO 2-NTAs Nano-Heterostructures and Oxygen Vacancy for Elevated Charge Transfer and Enhanced Photoelectrochemical Performances. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:4042. [PMID: 36432328 PMCID: PMC9692637 DOI: 10.3390/nano12224042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 11/09/2022] [Accepted: 11/09/2022] [Indexed: 06/16/2023]
Abstract
Through the utilization of a facile procedure combined with anodization and hydrothermal synthesis, highly ordered alignment TiO2 nanotube arrays (TiO2-NTAs) were decorated with BiVO4 with distinctive crystallization phases of monoclinic scheelite (m-BiVO4) and tetragonal zircon (t-BiVO4), favorably constructing different molar ratios and concentrations of oxygen vacancies (Vo) for m&t-BiVO4/TiO2-NTAs heterostructured nanohybrids. Simultaneously, the m&t-BiVO4/TiO2-NTAs nanocomposites significantly promoted photoelectrochemical (PEC) activity, tested under UV-visible light irradiation, through photocurrent density testing and electrochemical impedance spectra, which were derived from the positive synergistic effect between nanohetero-interfaces and Vo defects induced energetic charge transfer (CT). In addition, a proposed self-consistent interfacial CT mechanism and a convincing quantitative dynamic process (i.e., rate constant of CT) for m&t-BiVO4/TiO2-NTAs nanoheterojunctions are supported by time-resolved photoluminescence and nanosecond time-resolved transient photoluminescence spectra, respectively. Based on the scheme, the m&t-BiVO4/TiO2-NTAs-10 nanohybrids exhibited a photodegradation rate of 97% toward degradation of methyl orange irradiated by UV-visible light, 1.14- and 1.04-fold that of m&t-BiVO4/TiO2-NTAs-5 and m&t-BiVO4/TiO2-NTAs-20, respectively. Furthermore, the m&t-BiVO4/TiO2-NTAs-10 nanohybrids showed excellent PEC biosensing performance with a detection limit of 2.6 μM and a sensitivity of 960 mA cm-2 M-1 for the detection of glutathione. Additionally, the gas-sensing performance of m&t-BiVO4/TiO2-NTAs-10 is distinctly superior to that of m&t-BiVO4/TiO2-NTAs-5 and m&t-BiVO4/TiO2-NTAs-20 in terms of sensitivity and response speed.
Collapse
Affiliation(s)
- Zhufeng Shao
- College of Physical Science and Technology, Bohai University, Jinzhou 121000, China
| | - Jianyong Cheng
- College of Physical Science and Technology, Bohai University, Jinzhou 121000, China
| | - Yonglong Zhang
- College of Physical Science and Technology, Bohai University, Jinzhou 121000, China
| | - Yajing Peng
- College of Physical Science and Technology, Bohai University, Jinzhou 121000, China
| | - Libin Shi
- College of Physical Science and Technology, Bohai University, Jinzhou 121000, China
| | - Min Zhong
- College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121000, China
| |
Collapse
|
3
|
Lermusiaux L, Roach L, Baron A, Treguer-Delapierre M. Bottom-up synthesis of meta-atoms as building blocks in self-assembled metamaterials : Recent advances and perspectives. NANO EXPRESS 2022. [DOI: 10.1088/2632-959x/ac6889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
Meta-atoms interact with light in interesting ways and offer a large range of exciting properties. They exhibit optical properties inaccessible by natural atoms but their fabrication is notoriously difficult because of the precision required. In this perspective, we present the current research landscape in making meta-atoms, with a focus on the most promising self-assembly approaches and main challenges to overcome, for the development of materials with novel properties at optical frequencies.
Collapse
|
4
|
Study of Oxygen Vacancies in TiO2 Nanostructures and Their Relationship with Photocatalytic Activity. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12073690] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
In this research work, we present the synthesis and characterization of four different TiO2 structures, such as nanotubes, nanocavities, nanosheets assembled on nanocavities and nanobowls assembled on nanocavities, prepared by electrochemical anodization using organic electrolytes. After synthesis, the structures were thermally annealed to pass from the amorphous phase to the anatase phase, which is one of the most important crystalline structures of TiO2 due to its high photocatalytic activity and stability. The unique morphology and topography were studied using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The elemental composition was determined by energy-dispersive X-ray spectroscopy (EDS). The anatase phase was verified by Raman microscopy and X-ray diffraction (XRD), the band gap energy was calculated by the Kubelka–Munk function, and the main defect states that generate the emission, as well as their lifetime, were determined by photoluminescence spectroscopy and time response photoluminescence (TRPL), respectively. The TiO2 nanomaterials were tested as catalysts in the photodegradation of a solution of methylene blue using a UV lamp at room temperature. The results showed complex morphologies and different surface roughness areas of these nanomaterials. Furthermore, a relationship between defect states, band gap energy, and photocatalytic activity was established. We found that the catalytic activity was improved as an effect of geometric parameters and oxygen vacancies.
Collapse
|
5
|
Liu D, Cai Z, Wu YN, Chen S. First-principles identification of V I + Cu idefect cluster in cuprous iodide: origin of red light photoluminescence. NANOTECHNOLOGY 2022; 33:195203. [PMID: 35021166 DOI: 10.1088/1361-6528/ac4aa5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 01/12/2022] [Indexed: 06/14/2023]
Abstract
Theγ-phase cuprous iodide (CuI) emerges as a promising transparent p-type semiconductor for next-generation display technology because of its wide direct band gap, intrinsic p-type conductivity, and high carrier mobility. Two main peaks are observed in its photoluminescence (PL). One is short wavelength (410-430 nm) emission, which is well attributed to the electronic transitions at Cu vacancy, whereas the other long wavelength emission (680-720 nm) has not been fully understood. In this paper, through first-principles simulations, we investigate the formation energies and emission line shapes for various defects, and discover that the intrinsic point defect clusterVI+Cui2+is the source of the long wavelength emission. Our finding is further supported by the prediction that the defect concentration decreases dramatically as the chemical condition changes from Cu-rich to I-rich, explaining the significant reduction in the red light emission if CuI is annealed in abundant I environment.
Collapse
Affiliation(s)
- Dingrong Liu
- Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics, East China Normal University, Shanghai 200241, People's Republic of China
| | - Zenghua Cai
- Key Laboratory of Computational Physical Sciences (MOE), and State Key Laboratory of ASIC and System, School of Microelectronics, Fudan University, Shanghai 200433, People's Republic of China
| | - Yu-Ning Wu
- Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics, East China Normal University, Shanghai 200241, People's Republic of China
| | - Shiyou Chen
- Key Laboratory of Computational Physical Sciences (MOE), and State Key Laboratory of ASIC and System, School of Microelectronics, Fudan University, Shanghai 200433, People's Republic of China
- Shanghai Qi Zhi Institute, Shanghai 200030, People's Republic of China
| |
Collapse
|
6
|
Kim SJ, Hwang JS, Park JE, Yang M, Kim S. Exploring SERS from complex patterns fabricated by multi-exposure laser interference lithography. NANOTECHNOLOGY 2021; 32:315303. [PMID: 33892481 DOI: 10.1088/1361-6528/abfb32] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 04/23/2021] [Indexed: 06/12/2023]
Abstract
Designing uniform plasmonic surfaces in a large area is highly recommended for surface-enhanced Raman scattering (SERS). As periodic morphologies exhibit uniform SERS and optical tunability, diverse fabrication methods of periodic nanostructures have been reported for SERS applications. Laser interference lithography (LIL) is one of the most versatile tools since it can rapidly fabricate periodic patterns without the usage of photomasks. Here, we explore complex interference patterns for spatially uniform SERS sensors and its cost-effective fabrication method termed multi-exposure laser interference lithography (MELIL). MELIL can produce nearly periodic profiles along every direction confirmed by mathematical background, and in virtue of periodicity, we show that highly uniform Raman scattering (relative standard deviation <6%) can also be achievable in complex geometries as the conventional hole patterns. We quantitatively characterize the Raman enhancement of the MELIL complex patterns after two different metal deposition processes, Au e-beam evaporation and Ag electroplating, which results in 0.387 × 105and 1.451 × 105in enhancement factor respectively. This alternative, vacuum-free electroplating method realizes an even more cost-effective process with enhanced performance. We further conduct the optical simulation for MELIL complex patterns which exhibits the broadened and shifted absorption peaks. This result supports the potential of the expanded optical tunability of the suggested process.
Collapse
Affiliation(s)
- Seong Jae Kim
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
| | - June Sik Hwang
- Department of Mechanical & Materials Engineering Education, Chungnam National University (CNU), Daejeon, Republic of Korea
| | - Jong-Eun Park
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
| | - Minyang Yang
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
- Department of Mechanical Engineering, The State University of New York Korea (SUNY Korea), Incheon, Republic of Korea
| | - Sanha Kim
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
| |
Collapse
|
7
|
Bouhamed A, Rajendran D, Frenzel P, Zubkova T, Al-Hamry A, Miesel D, Kamatchi V, Ramalingame R, Bautista-Quijano JR, Lang H, Baumann RR, Kanoun O. Customizing hydrothermal properties of inkjet printed sensitive films by functionalization of carbon nanotubes. NANOTECHNOLOGY 2021; 32:105708. [PMID: 33217748 DOI: 10.1088/1361-6528/abcc95] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Multiwalled carbon nanotubes (MWCNTs) are attractive materials for realizing sensors, owing to their high aspect ratio associated with excellent mechanical, electronic, and thermal properties. Moreover, their sensing properties can be tuned by introducing functional groups on their framework and adjusting the processing conditions. In this paper, we investigate the potential of functionalized CNTs for humidity and temperature sensing by optimization of the functionalization, the processing conditions and the printing conditions. The morphology of the differently functionalized MWCNTs is investigated by infrared spectroscopy (IR), scanning electron microscopy, thermogravimetry (TG) and TG-coupled mass-spectrometric studies. Using the functionalized MWCNTs, films were fabricated with different numbers of layers (4, 6, 8, 10 layers) via inkjet printing on a flexible polyimide substrate containing an interdigital microelectrode. The influence of hydrothermal effects was investigated. The sensitivity to humidity is higher for films prepared with MWCNTs functionalized with a high sonication amplitude and a bigger number of layers due to enhancements of hydrophilicity and water mobility. A higher sensitivity to temperature is achieved by a low sonication amplitude and a small number of layers. For the encapsulation of the temperature sensor against humidity, a Bectron layer is proposed, which reduces also the hysteresis effect. This study demonstrates the efficiency of carboxylic functionalized MWCNTs deposit by inkjet printing for realization of sensitive and cost-effective humidity and temperature sensors. It provides a real example for the interesting contribution of functionalization procedures to the sensing properties of MWCNTs films.
Collapse
Affiliation(s)
- A Bouhamed
- Technische Universität Chemnitz, Chair of Measurement and Sensor Technology, Chemnitz, Germany
| | - D Rajendran
- Technische Universität Chemnitz, Chair of Measurement and Sensor Technology, Chemnitz, Germany
| | - P Frenzel
- Technische Universität Chemnitz, Inorganic Chemistry, Chemnitz, Germany
| | - T Zubkova
- Technische Universität Chemnitz, Print and Media Technology, Chemnitz, Germany
| | - A Al-Hamry
- Technische Universität Chemnitz, Chair of Measurement and Sensor Technology, Chemnitz, Germany
| | - D Miesel
- Technische Universität Chemnitz, Inorganic Chemistry, Chemnitz, Germany
| | - V Kamatchi
- Technische Universität Chemnitz, Chair of Measurement and Sensor Technology, Chemnitz, Germany
| | - R Ramalingame
- Technische Universität Chemnitz, Chair of Measurement and Sensor Technology, Chemnitz, Germany
| | - J R Bautista-Quijano
- Technische Universität Chemnitz, Chair of Measurement and Sensor Technology, Chemnitz, Germany
| | - H Lang
- Technische Universität Chemnitz, Inorganic Chemistry, Chemnitz, Germany
| | - R R Baumann
- Technische Universität Chemnitz, Print and Media Technology, Chemnitz, Germany
| | - O Kanoun
- Technische Universität Chemnitz, Chair of Measurement and Sensor Technology, Chemnitz, Germany
| |
Collapse
|
8
|
Dong J, Cao Y, Han Q, Gao W, Li T, Qi J. Nanoscale flexible Ag grating/AuNPs self-assembly hybrid for ultra-sensitive sensors. NANOTECHNOLOGY 2021; 32:155603. [PMID: 33511966 DOI: 10.1088/1361-6528/abd7b2] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In this paper, Au nanoparticles (AuNPs) are prepared using wet chemical reduction transfer of dense AuNPs film by self-assembly to the surface of Ag grating, which is inverted from the inner DVD after evaporation. The Ag grating/AuNPs self-assembly hybrid substrate commonly used in surface-enhanced Raman scattering (SERS) research is produced. The coupling effect between AuNP-AuNP and AuNPs-Ag slugs can evidently enhance the local electric field. Experimental results show that the hybrid SERS substrate can detect 10-9 M Rh6G, and the enhancement factor reaches 4.4 × 105. This small, cheap hybrid substrate has enormous potential in the field of SERS sensing.
Collapse
Affiliation(s)
- Jun Dong
- School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an, 710121, People's Republic of China
| | | | | | | | | | | |
Collapse
|
9
|
Gomes EO, Gracia L, Santiago AAG, Tranquilin RL, Motta FV, Amoresi RAC, Longo E, Bomio MRD, Andres J. Structure, electronic properties, morphology evolution, and photocatalytic activity in PbMoO 4 and Pb 1-2xCa xSr xMoO 4 ( x = 0.1, 0.2, 0.3, 0.4 and 0.5) solid solutions. Phys Chem Chem Phys 2020; 22:25876-25891. [PMID: 33156308 DOI: 10.1039/d0cp04596a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work PbMoO4 and Pb1-2xCaxSrxMoO4 (x = 0.1, 0.2, 0.3, 0.4 and 0.5) solid solutions have been successfully prepared, for the first time, by a simple co-precipitation method and the as-synthesized samples were subjected to a water-based reflux treatment. Structural characterization of these samples was performed using X-ray diffraction with Rietveld refinement analysis and Raman spectroscopy. Their optical properties were investigated by UV-Vis absorption spectroscopy and PL emissions, and the photocatalytic activity of the as-synthesized samples for the degradation process of Rhodamine B has been demonstrated. The surface structure and morphologies were characterized by field emission scanning electron microscopy. To complement and rationalize the experimental results, the geometry, electronic structures, and morphologies of as-synthesized samples were characterized by first-principles quantum-mechanical calculations at the density functional theory level. By using Wulff construction, based on the values of the surface energies for the (001), (100), (110), (111), (011) and (112) surfaces, a complete map of the available morphologies for PbMoO4 was obtained and a good agreement between the experimental and theoretical predicted morphologies was found. The structural and electronic changes induced by the substitution of Pb by Ca and Sr allow us to find a relationship among morphology, the electron-transfer process at the exposed surfaces, optical properties, and photocatalytic activity. We believe that our results offer new insights regarding the local coordination of superficial Pb/Ca/Sr and Mo cations (i.e., clusters) on each exposed surface of the corresponding morphology, which dictate the photocatalytic activities of the as-synthesized samples, a field that has so far remained unexplored. The present study, which combines multiple experimental methods and first-principles calculations, provides a deep understanding of the local structures, bonding, morphologies, band gaps, and electronic and optical properties, and opens the door to exploit the electrical, optical and photocatalytic activity of this very promising family of materials.
Collapse
Affiliation(s)
- E O Gomes
- Department of Analytical and Physical Chemistry, Universitat Jaume I, 12071 Castelló, Spain.
| | | | | | | | | | | | | | | | | |
Collapse
|