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Sharma M, Mazumder N, Ajayan PM, Deb P. Quantum enhanced efficiency and spectral performance of paper-based flexible photodetectors functionalized with two dimensional materials. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:283001. [PMID: 38574668 DOI: 10.1088/1361-648x/ad3abf] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 04/04/2024] [Indexed: 04/06/2024]
Abstract
Flexible photodetectors (PDs) have exotic significance in recent years due to their enchanting potential in future optoelectronics. Moreover, paper-based fabricated PDs with outstanding flexibility unlock new avenues for future wearable electronics. Such PD has captured scientific interest for its efficient photoresponse properties due to the extraordinary assets like significant absorptive efficiency, surface morphology, material composition, affordability, bendability, and biodegradability. Quantum-confined materials harness the unique quantum-enhanced properties and hold immense promise for advancing both fundamental scientific understanding and practical implication. Two-dimensional (2D) materials as quantum materials have been one of the most extensively researched materials owing to their significant light absorption efficiency, increased carrier mobility, and tunable band gaps. In addition, 2D heterostructures can trap charge carriers at their interfaces, leading increase in photocurrent and photoconductivity. This review represents comprehensive discussion on recent developments in such PDs functionalized by 2D materials, highlighting charge transfer mechanism at their interface. This review thoroughly explains the mechanism behind the enhanced performance of quantum materials across a spectrum of figure of merits including external quantum efficiency, detectivity, spectral responsivity, optical gain, response time, and noise equivalent power. The present review studies the intricate mechanisms that reinforce these improvements, shedding light on the intricacies of quantum materials and their significant capabilities. Moreover, a detailed analysis of the technical applicability of paper-based PDs has been discussed with challenges and future trends, providing comprehensive insights into their practical usage in the field of future wearable and portable electronic technologies.
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Affiliation(s)
- Monika Sharma
- Advanced Functional Material Laboratory (AFML), Department of Physics, Tezpur University, (Central University), Tezpur 784028, India
| | - Nirmal Mazumder
- Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Pulickel M Ajayan
- Department of Materials Science and Nano Engineering, Rice University, Houston, TX 77005, United States of America
| | - Pritam Deb
- Advanced Functional Material Laboratory (AFML), Department of Physics, Tezpur University, (Central University), Tezpur 784028, India
- Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
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2
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Hu XL, Li F, Xu SH, Liu WJ. Design of a binary metal micron grating and its application in near-infrared hot-electron photodetectors. OPTICS LETTERS 2023; 48:4033-4036. [PMID: 37527111 DOI: 10.1364/ol.497058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 07/06/2023] [Indexed: 08/03/2023]
Abstract
Metal plasmonic nano-gratings possess a high absorption ability and exhibit potential applications in sensing, hot-electron photodetection, metasurfaces, etc. However, the fabrication techniques of high-quality nano-gratings are challenging. In this article, a binary metal micron grating for near-infrared hot-electron photodetectors (HEPDs) is designed in which the surface plasmons are excited by high-diffraction-order modes. The high-diffraction-order micron grating can be fabricated by conventional lithography and has a significantly higher tolerance in the grating parameters than a nano-grating. The range of absorption greater than 70% is ∼3 times that of a nano-grating. Moreover, an interesting relationship between the resonant wavelength and the grating duty cycle is found. When the high-diffraction-order micron grating is applied in metal-insulator-metal HEPDs, a high zero-biased responsivity of 0.533 mA/W is achieved.
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3
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He W, Guo X, Xia P, Lu S, Zhang Y, Fan H. Temperature and pressure sensitive ionic conductive triple-network hydrogel for high-durability dual signal sensors. J Colloid Interface Sci 2023; 647:456-466. [PMID: 37271090 DOI: 10.1016/j.jcis.2023.05.149] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Revised: 05/17/2023] [Accepted: 05/22/2023] [Indexed: 06/06/2023]
Abstract
In this work, the fabrication of strengthened triple network hydrogels was successfully achieved based on in-situ polymerization of polyacrylamide by combining both chemical and physical cross-linking methods. The ion conductive phase of lithium chloride (LiCl) and solvent in the hydrogel were regulated through soaking solution. The pressure and temperature sensing behavior and durability of the hydrogel were investigated. The hydrogel containing 1 mol/L LiCl and 30 %v/v glycerol displayed a pressure sensitivity of 4.16 kPa-1 and a temperature sensitivity of 2.04 %/oC ranging from 20 to 50 °C. The durability results reveal that the hydrogel could maintain water retention rate of 69 % after 20 days of ageing. The presence of LiCl disrupted the interactions among water molecules and made it possible for the hydrogel to respond to changes in environment humidity. The dual signal testing revealed that the delay of temperature response over time (about 100 s) is much different from the rapidity of pressure response (in 0.5 s). This leads to the obvious separation of the temperature-pressure dual signal output. The assembled hydrogel sensor was further applied to monitor human motion and skin temperature. The signals can be distinguished by different resistance variation values and curve shapes in the typical temperature-pressure dual signal performance of human breathing. This demonstrates that this ion conductive hydrogel has the potential for application in flexible sensors and human-machine interfaces.
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Affiliation(s)
- Weidi He
- College of Materials & Metallurgy, Guizhou University, Guiyang Guizhou 550025, China; National Engineering Research Center for Compounding and Modification of Polymeric Materials, Guiyang Guizhou 550014, China
| | - Xincheng Guo
- College of Materials & Metallurgy, Guizhou University, Guiyang Guizhou 550025, China
| | - Peng Xia
- College of Materials & Metallurgy, Guizhou University, Guiyang Guizhou 550025, China
| | - Shengjun Lu
- College of Materials & Metallurgy, Guizhou University, Guiyang Guizhou 550025, China; National Engineering Research Center for Compounding and Modification of Polymeric Materials, Guiyang Guizhou 550014, China.
| | - Yufei Zhang
- College of Materials & Metallurgy, Guizhou University, Guiyang Guizhou 550025, China.
| | - Haosen Fan
- College of Materials & Metallurgy, Guizhou University, Guiyang Guizhou 550025, China.
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4
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Xin C, Zhao X, Geng H, Hao L, Li Y, Chen T, Gong P. Microstructure, grain and nanowire growth during selective laser melting of Ag-Cu/diamond composites. RSC Adv 2023; 13:3448-3458. [PMID: 36756599 PMCID: PMC9872257 DOI: 10.1039/d2ra05965g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 01/10/2023] [Indexed: 01/26/2023] Open
Abstract
Selective laser melting (SLM) technique is a viable alternative to fabricating metal matrix composites (MMCs) with controllable structures; however, its implementation remains challenging because of the unpredicted defects arising from the reinforcement. This study primarily examined the microstructural evolution and grain growth in the Ag-Cu/diamond composites at the molten pool scale during the SLM process via a thermodynamic analysis. The feasibility of manufacturing Ag-Cu/diamond composites was verified using several processing parameters. Moreover, the influence of energy density on the microstructures and grain growth was also demonstrated theoretically and experimentally. The formation of different kinds of grain morphologies in the molten pool was ascribed to the temperature gradient and cooling rate, corresponding to the direction and size of grain growth. The generation of Ag-Cu nanowires at the grain boundaries was firstly found in the SLM technique, which was related to the pressure stress generated by the high cooling rate of SLM. This work hopefully opens new paths for the applications of high-performance Ag-Cu/diamond MMCs in various application fields. It also provides new possibilities for the controllable manufacturing of Ag nanowires during SLM.
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Affiliation(s)
- Chenxing Xin
- Gemmological Institute, China University of Geosciences Wuhan 430074 P. R. China.,Advanced Manufacturing Centre, China University of Geosciences Wuhan 430074 P. R. China
| | - Xiya Zhao
- Gemmological Institute, China University of Geosciences Wuhan 430074 P. R. China.,Advanced Manufacturing Centre, China University of Geosciences Wuhan 430074 P. R. China
| | - Haoze Geng
- Gemmological Institute, China University of Geosciences Wuhan 430074 P. R. China.,Advanced Manufacturing Centre, China University of Geosciences Wuhan 430074 P. R. China
| | - Liang Hao
- Gemmological Institute, China University of Geosciences Wuhan 430074 P. R. China.,Advanced Manufacturing Centre, China University of Geosciences Wuhan 430074 P. R. China
| | - Yan Li
- Gemmological Institute, China University of Geosciences Wuhan 430074 P. R. China.,Advanced Manufacturing Centre, China University of Geosciences Wuhan 430074 P. R. China
| | - Tao Chen
- Gemmological Institute, China University of GeosciencesWuhan430074P. R. China
| | - Ping Gong
- Gemmological Institute, China University of GeosciencesWuhan430074P. R. China
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5
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Wang C, Zhang L, Zhou G, Qiu J, Liu Y, Yang R, Chi J, Wang J. Synthesis of environmental-friendly ion-imprinted magnetic nanocomposite bentonite for selective recovery of aqueous Sc(III). J Colloid Interface Sci 2023; 630:738-750. [DOI: 10.1016/j.jcis.2022.10.161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 10/24/2022] [Accepted: 10/30/2022] [Indexed: 11/06/2022]
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6
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Petrova V, Corrao AA, Wang S, Xiao Y, Chapman KW, Fullerton EE, Khalifah PG, Liu P. Synthesis of flexible Co nanowires from bulk precursors. RSC Adv 2022; 12:21153-21159. [PMID: 35975062 PMCID: PMC9341434 DOI: 10.1039/d2ra03790d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 07/06/2022] [Indexed: 11/21/2022] Open
Abstract
This work reports a method of producing flexible cobalt nanowires (NWs) directly from the chemical conversion of bulk precursors at room temperature. Chemical reduction of Li6CoCl8 produces a nanocomposite of Co and LiCl, of which the salt is subsequently removed. The dilute concentration of Co in the precursor combined with the anisotropic crystal structure of the hcp phase leads to 1D growth in the absence of any templates or additives. The Co NWs are shown to have high saturation magnetization (130.6 emu g-1). Our understanding of the NW formation mechanism points to new directions of scalable nanostructure generation.
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Affiliation(s)
- Victoria Petrova
- Department of Nanoengineering, University of California-San Diego La Jolla California 92093 USA
| | - Adam A Corrao
- Department of Chemistry, Stony Brook University Stony Brook NY 11794 USA
| | - Shen Wang
- Department of Nanoengineering, University of California-San Diego La Jolla California 92093 USA
| | - Yuxuan Xiao
- Center for Memory and Recording Research, University of California San Diego La Jolla CA 92093-0401 USA
| | - Karena W Chapman
- Department of Chemistry, Stony Brook University Stony Brook NY 11794 USA
| | - Eric E Fullerton
- Center for Memory and Recording Research, University of California San Diego La Jolla CA 92093-0401 USA
| | - Peter G Khalifah
- Department of Chemistry, Stony Brook University Stony Brook NY 11794 USA
- Chemistry Division, Brookhaven National Laboratory Upton New York 11973 USA
| | - Ping Liu
- Department of Nanoengineering, University of California-San Diego La Jolla California 92093 USA
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Zhang T, Mao S, Sun P, Gao X, Fang H, Luo H, Zhang W, Zhou B. Nanosized FeS/ZnS heterojunctions derived using zeolitic imidazolate Framework-8 (ZIF-8) for pH-universal oxygen reduction and High-efficiency Zn-air battery. J Colloid Interface Sci 2022; 608:446-458. [PMID: 34626988 DOI: 10.1016/j.jcis.2021.09.134] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 09/21/2021] [Accepted: 09/22/2021] [Indexed: 12/13/2022]
Abstract
Low-cost, stable, and highly active electrocatalysts for oxygen reduction reaction (ORR), especially for pH-universal ORR, are vital for developing numerous renewable energy devices. Herein, a hierarchical N, S-codoped porous carbon-based catalyst (ZFP-800) coupled with abundant FeS/ZnS heterojunctions was facilely prepared via direct pyrolysis of a Ferrocene-crosslinked pyrrole hydrogel composited with zeolitic imidazolate framework-8 (ZIF-8) templates. Compared with the heterojunction-free catalytic activity, the ZFP-800 catalytic activity was significantly higher in pH-universal ranges. Moreover, the ZFP-800 exhibited competitive ORR performance to commercial Pt/C (20%) in various electrolytes, in terms of onset (Eonset), half-wave potentials (E1/2), limiting current density (JL), durability, and methanol immunity. For instance, it exhibited super ORR catalytic activity on Eonset and E1/2, and exceeded that of the benchmark Pt/C in both the alkaline and neutral media. Furthermore, the application of ZFP-800 as a cathode catalyst in a home-made Zn-air battery demonstrated its operation capability in ambient conditions with a competitive performance on the specific energy density (828 mA·h·gZn-1), maximum discharge power density (205.6 mW·cm-2), rate performance, and the long-term stability (188 h at 5 mA·cm-2). This study can facilitate the development of advanced heterojunction-based materials for renewable energy applications.
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Affiliation(s)
- Teng Zhang
- School of Pharmacy, Weifang Medical University, Weifang, Shandong 261053, PR China
| | - Shumei Mao
- School of Pharmacy, Weifang Medical University, Weifang, Shandong 261053, PR China
| | - Peng Sun
- School of Pharmacy, Weifang Medical University, Weifang, Shandong 261053, PR China
| | - Xiaoyi Gao
- School of Pharmacy, Weifang Medical University, Weifang, Shandong 261053, PR China
| | - Hui Fang
- School of Pharmacy, Weifang Medical University, Weifang, Shandong 261053, PR China
| | - Haotian Luo
- School of Pharmacy, Weifang Medical University, Weifang, Shandong 261053, PR China
| | - Weifen Zhang
- School of Pharmacy, Weifang Medical University, Weifang, Shandong 261053, PR China
| | - Baolong Zhou
- School of Pharmacy, Weifang Medical University, Weifang, Shandong 261053, PR China.
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8
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Priyadarshini P, Das S, Alagarasan D, Ganesan R, Varadharajaperumal S, Sahoo S, Naik R. The impact of fluence dependent proton ion irradiation on the structural and optical properties of Bi 5In 30Se 65 thin films for nonlinear optical devices. RSC Adv 2022; 12:5012-5026. [PMID: 35425520 PMCID: PMC8981220 DOI: 10.1039/d2ra00097k] [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: 01/06/2022] [Accepted: 01/25/2022] [Indexed: 01/03/2023] Open
Abstract
This paper reports the effects of ion irradiation on the structural, linear, and nonlinear optical properties of thermally evaporated Bi5In30Se65 thin films. The prepared films were irradiated with 30 keV proton ions with different fluences, such as 5 × 1015 ions per cm2, 1 × 1016 ions per cm2, and 5 × 1016 ions per cm2. Structural analysis via X-ray diffraction (XRD) confirmed the non-crystalline nature of the film after ion irradiation with different doses. However, after the irradiation dose, the surface morphology changed, as shown by atomic force microscopy (AFM) images and field emission scanning electron microscopy (FESEM) images. The compositions of the films were obtained using energy-dispersive X-ray spectroscopy (EDX). Optical analysis via UV-Visible spectroscopy showed a reduction in the transmittance and an increase in the absorption in the higher wavelength region with irradiation. The optical bandgap and Tauc parameter decreased with an increase in the irradiation fluence, which is due to an increase in the irradiation-induced defects and disorder inside the system. The increases in the third order nonlinear susceptibility and the nonlinear refractive index with ion fluence are useful for nonlinear optical applications. The linear refractive index calculated from the transmittance data increased, satisfying Moss's rule. The optical parameters, such as lattice dielectric constant, optical density, skin depth, optical conductivity, real and imaginary dielectric constants, optical conductivity, loss factor, VELF, and SELF, were calculated using several empirical relationships and showed increasing behavior with the ion irradiation dose. The changes obtained in both the linear and nonlinear parameters will be useful for nonlinear optical device applications.
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Affiliation(s)
- P Priyadarshini
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
| | - S Das
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
| | - D Alagarasan
- Department of Physics, Indian Institute of Science Bangalore 560012 India
| | - R Ganesan
- Department of Physics, Indian Institute of Science Bangalore 560012 India
| | - S Varadharajaperumal
- Centre for Nano Science and Engineering, Indian Institute of Science Bangalore-560012 India
| | - S Sahoo
- Laboratory for Low Dimensional Materials, Institute of Physics Bhubaneswar 751005 India
- Homi Bhabha Training School Complex Anushakti Nagar Mumbai 400094 India
| | - R Naik
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
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9
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Qiu S, Liang J, Hou Y, Zhou X, Zhou Y, Wang J, Zou B, Xing W, Hu Y. Hindered phenolic antioxidant passivation of black phosphorus affords air stability and free radical quenching. J Colloid Interface Sci 2022; 606:1395-1409. [PMID: 34492475 DOI: 10.1016/j.jcis.2021.08.098] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 08/13/2021] [Accepted: 08/14/2021] [Indexed: 02/08/2023]
Abstract
As an antioxidant, hindered phenol scavenges free radicals. Due to the oxidative degradation of black phosphorus (BP) in the presence of water and oxygen, free radical quenching of hindered phenol antioxidants can solve this issue and improve the environmental stability and flame retardant efficiency of BP. Herein, hydroxyl-modified BP (BP-OH) with active groups on the surface was obtained by hydroxylation, and then the hindered phenol antioxidant was grafted onto the surface of BP-OH through an isophorone diisocyanate bridging covalent reaction to obtain hindered phenol-modified BP (BP-HPL). The fire hazard of thermoplastic polyurethane (TPU) can be significantly reduced by introducing BP-HPL into TPU. Adding 2 wt% BP-HPL can reduce the heat release rate and total heat release values of TPU by 49.9% and 49.0%, respectively. In addition, the reductions in smoke volume and carbon monoxide production were also significant. Compared with BP-OH, the environmental stability of BP-HPL is significantly improved. This work provides a reference for the application of BP in the field of fire safety and simultaneously achieves the improvement of the environmental stability and flame retardant performance of BP.
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Affiliation(s)
- Shuilai Qiu
- State Key Laboratory of Fire Science, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, PR China
| | - Jing Liang
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Yanbei Hou
- State Key Laboratory of Fire Science, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, PR China
| | - Xia Zhou
- State Key Laboratory of Fire Science, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, PR China
| | - Yifan Zhou
- State Key Laboratory of Fire Science, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, PR China
| | - Jingwen Wang
- State Key Laboratory of Fire Science, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, PR China
| | - Bin Zou
- State Key Laboratory of Fire Science, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, PR China
| | - Weiyi Xing
- State Key Laboratory of Fire Science, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, PR China.
| | - Yuan Hu
- State Key Laboratory of Fire Science, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, PR China.
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Patel RP, Pataniya PM, Patel M, Sumesh CK. WSe 2crystals on paper: flexible, large area and broadband photodetectors. NANOTECHNOLOGY 2021; 32:505202. [PMID: 34525463 DOI: 10.1088/1361-6528/ac26fe] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 09/15/2021] [Indexed: 06/13/2023]
Abstract
The paper-based photodetector has recently captivated a great deal of attention in various opto-electronics applications because of facile, cost effective and green synthesis. Two-dimensional transition metal dichalcogenides materials are promising for photodetection under the broad spectral range. In this work, we have fabricated paper-based device by rubbing the tungsten di-selenide (WSe2) crystals on paper substrate. Low-cost, facile and green synthesis technique was employed to make a high-performance paper-based WSe2photodetector. Paper-based photodetector was fabricated via non-toxic simply rubbing process of WSe2nanosheets on low-cost bio-degradable paper. The photodetector shows good responsivity of 72.5 μA W-1and detectivity at around 2.4 × 107Jones at very low bias (1.0 V) at wavelength of 780 nm, respectively. Due to good photo-absorption strength, photodetector exhibits excellent photo-response over wide wavelength range from visible to near infrared. This device also shows very good flexibility with a stable photo-response. This device shows a general and reliable study for the design of photodetectors that is eco-friendly and cost-effective. Overall studied results of the fabricated device indicate that they have the ability to be used in large-scale preparation of the device.
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Affiliation(s)
- Rahul P Patel
- Department of Physical Sciences, P D Patel Institute of Applied Sciences, Charotar University of Science and Technology, CHARUSAT, Changa, Gujarat, India
| | - Pratik M Pataniya
- Department of Physical Sciences, P D Patel Institute of Applied Sciences, Charotar University of Science and Technology, CHARUSAT, Changa, Gujarat, India
| | - Meswa Patel
- Department of Physical Sciences, P D Patel Institute of Applied Sciences, Charotar University of Science and Technology, CHARUSAT, Changa, Gujarat, India
| | - C K Sumesh
- Department of Physical Sciences, P D Patel Institute of Applied Sciences, Charotar University of Science and Technology, CHARUSAT, Changa, Gujarat, India
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Mehmood F, Pachter R, Back TC, Boeckl JJ, Busch RT, Stevenson PR. Two-dimensional MoS 2 2H, 1T, and 1T ' crystalline phases with incorporated adatoms: theoretical investigation of electronic and optical properties. APPLIED OPTICS 2021; 60:G232-G242. [PMID: 34613214 DOI: 10.1364/ao.433239] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 07/18/2021] [Indexed: 06/13/2023]
Abstract
Although there has been progress in studying the electronic and optical properties of monolayer and near-monolayer (two-dimensional, 2D) MoS2 upon adatom adsorption and intercalation, understanding the underlying atomic-level behavior is lacking, particularly as related to the optical response. Alkali atom intercalation in 2D transition metal dichalcogenides (TMDs) is relevant to chemical exfoliation methods that are expected to enable large scale production. In this work, focusing on prototypical 2D MoS2, the adsorption and intercalation of Li, Na, K, and Ca adatoms were investigated for the 2H, 1T, and 1T' phases of the TMD by the first principles density functional theory in comparison to experimental characterization of 2H and 1T 2D MoS2 films. Our electronic structure calculations demonstrate significant charge transfer, influencing work function reductions of 1-1.5 eV. Furthermore, electrical conductivity calculations confirm the semiconducting versus metallic behavior. Calculations of the optical spectra, including excitonic effects using a many-body theoretical approach, indicate enhancement of the optical transmission upon phase change. Encouragingly, this is corroborated, in part, by the experimental measurements for the 2H and 1T phases having semiconducting and metallic behavior, respectively, thus motivating further experimental exploration. Overall, our calculations emphasize the potential impact of synthesis-relevant adatom incorporation in 2D MoS2 on the electronic and optical responses that comprise important considerations toward the development of devices such as photodetectors or the miniaturization of electroabsorption modulator components.
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Shameli MA, Mirnaziry SR, Yousefi L. Distributed silicon nanoparticles: an efficient light trapping platform toward ultrathin-film photovoltaics. OPTICS EXPRESS 2021; 29:28037-28053. [PMID: 34614943 DOI: 10.1364/oe.433521] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 08/04/2021] [Indexed: 06/13/2023]
Abstract
In this paper, a new architecture comprising silicon nanoparticles inside a hole transport layer laid on a thin silicon layer is proposed to develop ultrathin film solar cells. Using generalized Mie theory, a fast analytical approach is developed to evaluate the optical absorption of the proposed structure for various geometries, polarizations and angles of incidence. The analytical results are verified through comparison with full-wave simulations, illustrating a reasonable agreement. The electrical performance of a distributed silicon nanoparticle solar cell is determined for selected configurations. To be able to predict the light-trapping in a solar cell comprising randomly distributed nanospheres, a new technique based on probability theory is developed and validated through comparison with the simulation results. Both analytical and numerical results show that the excited Mie resonant modes in the proposed structure lead to a significant enhancement in both absorption and the photo-generated current, in comparison to a conventional silicon solar cell with an equivalent volume of the active layer. In the case of random distributions, other advantages, including the simple fabrication process, indicate that the cell is a promising structure for ultrathin photovoltaics.
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13
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Huang CC, Chang RJ, Huang CC. Nanostructured hybrid plasmonic waveguide in a slot structure for high-performance light transmission. OPTICS EXPRESS 2021; 29:29341-29356. [PMID: 34615045 DOI: 10.1364/oe.438771] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 08/17/2021] [Indexed: 06/13/2023]
Abstract
Squeezing light to nanoscale is the most vital capacity of nanophotonic circuits processing on-chip optical signals that allows to significantly enhance light-matter interaction by stimulating various nonlinear optical effects. It is well known that plasmon can offer an unrivaled concentration of optical energy beyond the optical diffraction limit. However, the progress of plasmonic technology is mainly hindered by its ohmic losses, thus leading to the difficulty in building large-area photonic integrated circuits. To significantly increase the propagation distance of light, we develop a new waveguide structure operating at the telecommunication wavelength of 1,550 nm. It consists of a nanostructured hybrid plasmonic waveguide embedded in a high-index-contrast slot waveguide. We capitalize on the strong mode confinement of the slot waveguide and reduce mode areas with the nanostructured hybrid plasmonic configuration while maintaining extremely low ohmic losses using a nanoscale metal strip. The proposed design achieves a record propagation distance of 1,115 µm while comparing with that of other designs at a mode area of the order of 10-5A0 (A0 is the diffraction-limited area). The mode characterization considering fabrication imperfections and spectral responses show the robustness and broadband operation range of the proposed waveguide. Moreover, we also investigated the crosstalk to assess the density of integration. The proposed design paves the way for building nanophotonic circuits and optoelectronic devices that require strong light-matter interaction.
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14
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Zhang Y, Li L, Shi D, Song F. Synthesis and application of low-cost layered double hydroxides intercalated by gluconic acid anion for flame retardancy and tensile strength conservation of high filling epoxy resin. J Colloid Interface Sci 2021; 594:791-801. [PMID: 33794401 DOI: 10.1016/j.jcis.2021.03.088] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 03/09/2021] [Accepted: 03/14/2021] [Indexed: 11/17/2022]
Abstract
Epoxy resin (EP) is a polymer that is widely used in different aspects of life, but its flammability property limits its fields of applications. Most flame retardants at present cannot be applied practically in scale due to their toxicity, incompatibility in polymers, degraded mechanical property or high cost of raw materials and comprehensive preparation process. Layered double hydroxides intercalated by gluconic acid anion (GLDHs) may serve as a new approach. GLDHs with Mg/Al ratio of 3/1 and 2/1 were first coprecipitated with low-cost green reactants, MgCl2·6H2O, AlCl3·6H2O, NaOH and sodium gluconate. Their structures were confirmed by X-ray diffractions (XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR) and elemental analysis; their thermal properties were analyzed by thermo gravimetric analysis (TGA). Composites containing 40 wt.% GLDHs were easily manufactured with normal magnetic stirring without any filler precipitation. The combustion properties of the composites filled with 40 wt.% GLDHs2 are as follows: the limit oxygen index (LOI) could rise to 29.8% from 25.2% of pristine EP; UL-94 can reach V-1 level with total burning time of only 12.1 s without dropping; compared to pristine EP, the heat release rate peak (PHRR) could drop to 30% with heavy decrease in the smoke production rate and CO production rate. Dynamic mechanical thermal analysis (DMA) tests showed that the addition of 40 wt.% GLDHs had little impact on the glass transition temperature of the composites and could slightly improve their rigidity and toughness. Tensile strength of the composites filled with 40 wt.% GLDHs2 was almost close to 88% of the tensile strength of pristine EP. Above all, GLDHs with good compatibility in polymers can serve as a promising environmental friendly and low-cost flame retardant for EP and other heterochain polymers.
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Affiliation(s)
- Yuze Zhang
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, Qinghai, China; Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, Xining 810008, Qinghai, China; University of Chinese Academy of Sciences, Beijing 10049, China
| | - Lijuan Li
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, Qinghai, China; Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, Xining 810008, Qinghai, China; Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China.
| | - Dong Shi
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, Qinghai, China; Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, Xining 810008, Qinghai, China
| | - Fugen Song
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, Qinghai, China; Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, Xining 810008, Qinghai, China.
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15
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Pereyra CJ, Campo L, Navarrete-Astorga E, Cuevas A, Romero R, Ariosa D, Henríquez R, Muñoz E, Martín F, Ramos-Barrado JR, Dalchiele EA, Marotti RE. Scattering of light by ZnO nanorod arrays. OPTICS LETTERS 2021; 46:2360-2363. [PMID: 33988583 DOI: 10.1364/ol.422706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 04/19/2021] [Indexed: 06/12/2023]
Abstract
The optical properties of ZnO nanorod (NR) arrays were investigated by optical total transmittance (TT) and diffuse reflectance (DR) spectroscopy in the visible region. The NRs were grown electrochemically in a three-electrode cell over a glass/fluorine-doped tin oxide (FTO) substrate. The mean length, radius, and density of NR samples were characterized by scanning electron microscopy. The results were correlated with the observed optical properties. Since light scattering for these NR arrays is highly dependent on their morphology, therefore, a model for light scattering based in the Mie theory for cylinders was implemented to understand the observed spectra. The mean scattering and extinction cross sections were calculated from the morphology of the samples. They were used to fit the DR spectra. From the fittings, the TT spectra of the samples could be calculated. A good agreement with the experimental results was obtained. This indicates that the implemented model represents well the observed scattering phenomena.
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16
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Pataniya PM, Bhakhar SA, Tannarana M, Zankat C, Patel V, Solanki G, Patel K, Jha PK, Late DJ, Sumesh C. Highly sensitive and flexible pressure sensor based on two-dimensional MoSe2 nanosheets for online wrist pulse monitoring. J Colloid Interface Sci 2021; 584:495-504. [DOI: 10.1016/j.jcis.2020.10.006] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 09/28/2020] [Accepted: 10/04/2020] [Indexed: 01/17/2023]
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17
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Khokhar D, Jadoun S, Arif R, Jabin S. Functionalization of conducting polymers and their applications in optoelectronics. POLYM-PLAST TECH MAT 2020. [DOI: 10.1080/25740881.2020.1819312] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Deepali Khokhar
- Department of Chemistry, Lingaya’s Vidyapeeth, Faridabad, India
| | - Sapana Jadoun
- Department of Chemistry, Lingaya’s Vidyapeeth, Faridabad, India
| | - Rizwan Arif
- Department of Chemistry, Lingaya’s Vidyapeeth, Faridabad, India
| | - Shagufta Jabin
- Department of Chemistry, Manav Rachna International Institute of Research & Studies, Faridabad, India
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18
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Zhang Y, Tang L, Teng KS. High performance broadband photodetectors based on Sb 2Te 3/n-Si heterostructure. NANOTECHNOLOGY 2020; 31:304002. [PMID: 32235040 DOI: 10.1088/1361-6528/ab851c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
With the rapid development of optoelectronic devices, photodetectors have triggered unprecedented promise in the field of optical communication, environmental monitoring, biological imaging, chemical sensing. At the same time, there is a higher requirement for photodetectors. It is still a huge challenge for photodetectors that possess excellent performance, low cost and broad range photoresponse from ultraviolet to infrared. In this work, a facile, low cost growth of Sb2Te3 thin film using magnetic sputtering was performed. After rapid annealing treatment, the crystallinity of the thin film was transformed from amorphous to polycrystalline. Ultraviolet-visible-infrared absorption study of the thin film revealed broad absorption range, which is ideal for use in broadband photodetectors. Such photodetectors can find many important applications in communication, data security, environmental monitoring and defense technology etc. A prototype photodetector, consisting of Sb2Te3/n-Si heterostructure, was produced and characterized. The device demonstrated a significant photoelectric response at a broad spectral range of between 250 and 2400 nm. The maximum responsivity and detectivity of the device were 270 A W-1 and 1.28 × 1013 Jones, respectively, under 2400 nm illumination. Therefore, the results showed the potential use of Sb2Te3 thin film in developing high performance broadband photodetectors.
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Affiliation(s)
- Yuping Zhang
- Kunming Institute of Physics, Kunming 650223, People's Republic of China. Yunnan Key Laboratory of Advanced Photoelectric Materials & Devices, No.31 East Jiaochang Road, Kunming 650223, People's Republic of China
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19
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Deb P, Dhar JC. Boosted photoresponsivity using silver nanoparticle decorated TiO 2 nanowire/reduced graphene oxide thin-film heterostructure. NANOTECHNOLOGY 2020; 31:285202. [PMID: 32182602 DOI: 10.1088/1361-6528/ab8084] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Here, we report on the fabrication and use of a silver (Ag) nanoparticle (NP) decorated TiO2 nanowire (NW)/reduced graphene oxide (RGO) thin-film (TF) heterostructure as a UV detector, using a controlled method called the glancing angle deposition technique. Transmission electron microscope images show Ag NPs (size 7-13 nm) covering the entire surface of the TiO2 NWs. A high absorption as well as photoluminescence for the Ag NP-TiO2 NW/RGO TF sample reveals the generation of a large number of electron-hole pairs compared to bare TiO2 NW. The resulting plasmonic UV photodetector from the Ag NP-TiO2 NW/RGO TF exhibits a rectification ratio of 5039 (+10 V) and responsivity of 1760 A W-1 at 350 nm light (with power density as low as 0.58 µ W cm-2). Moreover, the device shows fast response speed (rise time of 157 ms and fall time of 488 ms) with detectivity and noise equivalent power of 6.659 × 1013 Jones and 51 fW, respectively. The enhanced plasmonic field and high scattering of light, along with the high mobility RGO layer at the bottom, result in the superior performance of the device.
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Affiliation(s)
- Prasenjit Deb
- Department of Electronics and Communication Engineering, National Institute of Technology Nagaland, Dimapur 797103, India
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20
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Anu Prathap MU, Castro-Pérez E, Jiménez-Torres JA, Setaluri V, Gunasekaran S. A flow-through microfluidic system for the detection of circulating melanoma cells. Biosens Bioelectron 2019; 142:111522. [PMID: 31336226 DOI: 10.1016/j.bios.2019.111522] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 07/03/2019] [Accepted: 07/16/2019] [Indexed: 12/19/2022]
Abstract
We report the fabrication of polyaniline nanofiber (PANI)-modified screen-printed electrode (PANI/SPE) incorporated in a poly-dimethylsiloxane (PDMS) microfluidic channel for the detection of circulating tumor cells. We employed this device to detect melanoma skin cancer cells through specific immunogenic binding of cell surface biomarker melanocortin 1 receptor (MC1R) to anti-MC1R antibody. The antibody-functionalized PANI/SPE was used in batch-continuous flow-through fashion. An aqueous cell suspension of ferri/ferrocyanide at a flow rate of 1.5 mL/min was passed over the immunosensor, which allowed for continuous electrochemical measurements. The sensor performed exceptionally well affording an ultralow limit of quantification of 1 melanoma cell/mL, both in buffer and when mixed with peripheral blood mononuclear cells, and the response was log-linear over the range of 10-9000 melanoma cells/10 mL.
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Affiliation(s)
| | - Edgardo Castro-Pérez
- Department of Dermatology, School of Medicine and Public Health, University of Wisconsin-Madison, 1300 University Avenue, Madison, WI, 53706, USA
| | - José A Jiménez-Torres
- Microtechnology, Medicine and Biology Lab Biomedical Engineering, College of Engineering University of Wisconsin-Madison, Madison, WI, 53705, USA
| | - Vijaysaradhi Setaluri
- Department of Dermatology, School of Medicine and Public Health, University of Wisconsin-Madison, 1300 University Avenue, Madison, WI, 53706, USA.
| | - Sundaram Gunasekaran
- Department of Biological Systems Engineering, University of Wisconsin-Madison, 460 Henry Mall, Madison, WI, 53706, USA.
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21
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Canjeevaram Balasubramanyam RK, Kandjani AE, Harrison CJ, Abdul Haroon Rashid SSA, Sabri YM, Bhargava SK, Narayan R, Basak P, Ippolito SJ. 1,4-Dihydropyrrolo[3,2-b]pyrroles as a Single Component Photoactive Layer: A New Paradigm for Broadband Detection. ACS APPLIED MATERIALS & INTERFACES 2017; 9:27875-27882. [PMID: 28777542 DOI: 10.1021/acsami.7b08906] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Single component organic photodetectors capable of broadband light sensing represent a paradigm shift for designing flexible and inexpensive optoelectronic devices. The present study demonstrates the application of a new quadrupolar 1,4-dihydropyrrolo[3,2-b]pyrrole derivative with spectral sensitivity across 350-830 nm as a potential broadband organic photodetector (OPD) material. The amphoteric redox characteristics evinced from the electrochemical studies are exploited to conceptualize a single component OPD with ITO and Al as active electrodes. The photodiode showed impressive broadband photoresponse to monochromatic light sources of 365, 470, 525, 589, 623, and 830 nm. Current density-voltage (J-V) and transient photoresponse studies showed stable and reproducible performance under continuous on/off modulations. The devices operating in reverse bias at 6 V displayed broad spectral responsivity (R) and very good detectivity (D*) peaking a maximum 0.9 mA W-1 and 1.9 × 1010 Jones (at 623 nm and 500 μW cm-2) with a fast rise and decay times of 75 and 140 ms, respectively. Low dark current densities ranging from 1.8 × 10-10 Acm-2 at 1 V to 7.2 × 10-9 A cm-2 at 6 V renders an operating range to amplify the photocurrent signal, spectral responsivity, and detectivity. Interestingly, the fabricated OPDs display a self-operational mode which is rarely reported for single component organic systems.
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Affiliation(s)
- Ram Kumar Canjeevaram Balasubramanyam
- School of Engineering (SoE), ‡School of Sciences, and §Centre for Advanced Materials and Industrial Chemistry, RMIT University , 124 La Trobe St, Melbourne, Victoria 3000, Australia
- Polymers and Functional Materials Division; RMIT-IICT Joint Research Centre, ⊥Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, and #Academy of Scientific & Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad, Telangana 500007, India
| | - Ahmad E Kandjani
- School of Engineering (SoE), ‡School of Sciences, and §Centre for Advanced Materials and Industrial Chemistry, RMIT University , 124 La Trobe St, Melbourne, Victoria 3000, Australia
- Polymers and Functional Materials Division; RMIT-IICT Joint Research Centre, ⊥Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, and #Academy of Scientific & Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad, Telangana 500007, India
| | - Christopher J Harrison
- School of Engineering (SoE), ‡School of Sciences, and §Centre for Advanced Materials and Industrial Chemistry, RMIT University , 124 La Trobe St, Melbourne, Victoria 3000, Australia
- Polymers and Functional Materials Division; RMIT-IICT Joint Research Centre, ⊥Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, and #Academy of Scientific & Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad, Telangana 500007, India
| | - Syed Sulthan Alaudeen Abdul Haroon Rashid
- School of Engineering (SoE), ‡School of Sciences, and §Centre for Advanced Materials and Industrial Chemistry, RMIT University , 124 La Trobe St, Melbourne, Victoria 3000, Australia
- Polymers and Functional Materials Division; RMIT-IICT Joint Research Centre, ⊥Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, and #Academy of Scientific & Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad, Telangana 500007, India
| | - Ylias M Sabri
- School of Engineering (SoE), ‡School of Sciences, and §Centre for Advanced Materials and Industrial Chemistry, RMIT University , 124 La Trobe St, Melbourne, Victoria 3000, Australia
- Polymers and Functional Materials Division; RMIT-IICT Joint Research Centre, ⊥Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, and #Academy of Scientific & Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad, Telangana 500007, India
| | - Suresh K Bhargava
- School of Engineering (SoE), ‡School of Sciences, and §Centre for Advanced Materials and Industrial Chemistry, RMIT University , 124 La Trobe St, Melbourne, Victoria 3000, Australia
- Polymers and Functional Materials Division; RMIT-IICT Joint Research Centre, ⊥Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, and #Academy of Scientific & Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad, Telangana 500007, India
| | - Ramanuj Narayan
- School of Engineering (SoE), ‡School of Sciences, and §Centre for Advanced Materials and Industrial Chemistry, RMIT University , 124 La Trobe St, Melbourne, Victoria 3000, Australia
- Polymers and Functional Materials Division; RMIT-IICT Joint Research Centre, ⊥Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, and #Academy of Scientific & Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad, Telangana 500007, India
| | - Pratyay Basak
- School of Engineering (SoE), ‡School of Sciences, and §Centre for Advanced Materials and Industrial Chemistry, RMIT University , 124 La Trobe St, Melbourne, Victoria 3000, Australia
- Polymers and Functional Materials Division; RMIT-IICT Joint Research Centre, ⊥Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, and #Academy of Scientific & Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad, Telangana 500007, India
| | - Samuel J Ippolito
- School of Engineering (SoE), ‡School of Sciences, and §Centre for Advanced Materials and Industrial Chemistry, RMIT University , 124 La Trobe St, Melbourne, Victoria 3000, Australia
- Polymers and Functional Materials Division; RMIT-IICT Joint Research Centre, ⊥Nanomaterials Laboratory, Inorganic and Physical Chemistry Division, and #Academy of Scientific & Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad, Telangana 500007, India
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22
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Zhang D, Liu C, Yin B, Xu R, Zhou J, Zhang X, Ruan S. Organics filled one-dimensional TiO 2 nanowires array ultraviolet detector with enhanced photo-conductivity and dark-resistivity. NANOSCALE 2017; 9:9095-9103. [PMID: 28643838 DOI: 10.1039/c7nr03408c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
A heterojunction photo-conductive ultraviolet (UV) detector was developed based on TiO2 nanowires array (NWA) surrounded by N,N'-bis-(1-naphthalenyl)-N,N'-bis-phenyl-(1,1'-biphenyl)-4,4'-diamine (NPB). The novel and effective two-step method of static infusion and dynamic solution-cleaning was employed to fill NPB into TiO2 NWA gaps and simultaneously remove the unwelcomed top NPB layer. The device fabricated via the two-step method exhibited optimal performance compared to TiO2/NPB device with top NPB layer and TiO2 NWA device. In dark conditions, the TiO2/NPB heterojunction device without top NPB was found to possess the capacity of depleting majority carriers, thereby providing improved dark-resistivity to limit the dark current (Id). Under UV illumination, the depleting effect could be eliminated by the dissociation and accumulation of photo-generated carriers between pn heterojunction, leading to increased carrier density and photo-conductivity. It cleared up the high barrier due to the removal of top NPB layer, which was beneficial for hot electron transport than the device with top NPB layer under illumination, thereby achieving an enhanced light current (Il) to Id ratio of 1.67 × 104. A simple technology is provided to prepare organic-inorganic hybrid one-dimensional array heterostructure, which plays a remarkable role in the working of the UV detector, enhancing photo-conductivity and dark-resistivity of the device.
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Affiliation(s)
- Dezhong Zhang
- State Key Laboratory on Integrated Optoelectronics, Jilin University, Changchun 130012, P. R. China.
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Fang H, Xu C, Ding J, Li Q, Sun JL, Dai JY, Ren TL, Yan Q. Self-Powered Ultrabroadband Photodetector Monolithically Integrated on a PMN-PT Ferroelectric Single Crystal. ACS APPLIED MATERIALS & INTERFACES 2016; 8:32934-32939. [PMID: 27934153 DOI: 10.1021/acsami.6b10305] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Photodetectors capable of detecting two or more bands simultaneously with a single system have attracted extensive attentions because of their critical applications in image sensing, communication, and so on. Here, we demonstrate a self-powered ultrabroadband photodetector monolithically integrated on a 0.72Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 (PMN-28PT) single crystal. By combining the optothermal and pyroelectric effect, the multifunctional PMN-28PT single crystal can response to a wide wavelength range from UV to terahertz (THz). At room temperature, the photodetector could generate a pyroelectric current under the intermittent illumination of incident light in absence of external bias. A systematic study of the photoresponse was investigated. The pyroelectric current shows an almost linear relationship to illumination intensity. Benefiting from the excellent pyroelectric property of PMN-28PT single crystal and the optimized device architecture, the device exhibited a dramatic improvement in operation frequency up to 3 kHz without any obvious degradation in sensitivity. Such a self-powered photodetector with ultrabroadband response may open a window for the novel application of ferroelectric materials in optoelectronics.
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Affiliation(s)
| | | | | | | | | | - Ji-Yan Dai
- Department of Applied Physics, The Hong Kong Polytechnic University , Hong Kong, China
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