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Kaleeswarran P, Sakthi Priya T, Chen TW, Chen SM, Kokulnathan T, Arumugam A. Construction of a Copper Bismuthate/Graphene Nanocomposite for Electrochemical Detection of Catechol. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:10162-10172. [PMID: 35939572 DOI: 10.1021/acs.langmuir.2c01151] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Binary metal oxides with carbon nanocomposites have received extensive attention as research hotspots in the electrochemistry field owing to their tunable properties and superior stability. This work illustrates the development of a facile sonochemical strategy for the synthesis of a copper bismuthate/graphene (GR) nanocomposite-modified screen-printed carbon electrode (CBO/GR/SPCE) for the electrochemical detection of catechol (CT). The formation of an as-prepared CBO/GR nanocomposite was comprehensively characterized. The electrochemical behavior of the CBO/GR/SPCE toward CT was investigated by voltammetry and amperometry techniques. The fabricated CBO/GR/SPCE manifests an excellent electrocatalytic performance toward CT with a lower peak potential and a higher current value compared to those of CBO/SPCE, GR/SPCE, and bare SPCE. It is attributed to enhanced electro-catalytic activity, synergetic effects, and good active sites of the CBO/GR nanocomposite. Under the electrochemical condition, the CBO/GR/SPCE displayed a wide linear sensing range, trace-level detection limit, acceptable sensitivity, and excellent selectivity. Furthermore, our proposed CBO/GR electrode was employed successfully for CT detection in water samples.
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Affiliation(s)
- Periyannan Kaleeswarran
- Department of Nanoscience and Technology, Alagappa University, Karaikudi 630 003, Tamil Nadu, India
- Department of Botany, Alagappa University, Karaikudi 630 003, Tamil Nadu, India
| | - Thangavelu Sakthi Priya
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 106, Taiwan
| | - Tse-Wei Chen
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 106, Taiwan
- Research and Development Center for Smart Textile Technology, National Taipei University of Technology, Taipei 106, Taiwan
- Department of Materials, Imperial College London, London SW7 2AZ, U.K
| | - Shen-Ming Chen
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 106, Taiwan
| | - Thangavelu Kokulnathan
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 106, Taiwan
| | - Ayyakannu Arumugam
- Department of Botany, Alagappa University, Karaikudi 630 003, Tamil Nadu, India
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2
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Lakshmy S, Kundu A, Kalarikkal N, Chakraborty B. Catechol sensor based on pristine and transition metal embedded holey graphyne: a first-principles density functional theory study. J Mater Chem B 2022; 10:5958-5967. [PMID: 35838275 DOI: 10.1039/d2tb00754a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
To develop a highly sensitive and selective biosensor for detecting noxious biomolecules from the environment, we examined catechol (Cc) adsorption in pristine and transition metal (TM = Sc, Cu, and Pd) embedded 2D holey graphyne (hGY) monolayers using the first-principles density functional theory method. The interaction between Cc and the pristine hGY is purely weak, and hence the response of the sensing device will be difficult to detect. Therefore, the TM doping strategy is adopted to improve the sensitivity. According to our findings, Sc binds strongly to the hGY monolayer, with a binding energy of -4.09 eV and a charge transfer of 1.89e from the valence orbitals of Sc to the C 2p orbitals. Later on, the Cc adsorption on the TM-embedded hGY was investigated. The interaction of Cc with the transition metal involves charge transfer from Cc to the metal d orbital. A large binding energy of -3.22 eV and a significant charge transfer of about 0.9e from the O 2p orbitals of Cc to the valence orbital of Sc suggest that the Sc embedded hGY monolayer is a good choice for the efficient sensing of Cc molecules. Furthermore, ab initio MD simulations confirmed the structural stability of the Sc + hGY system at room temperature. We strongly believe that this theoretical work will aid the experimentalists in designing and developing 2D semiconducting nanolayer-based biosensors for commercial purposes.
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Affiliation(s)
- Seetha Lakshmy
- International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala 686 560, India.
| | - Ajit Kundu
- Seismology Department, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Nandakumar Kalarikkal
- International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala 686 560, India. .,School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam, Kerala 686 560, India.,School of Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala 686560, India
| | - Brahmananda Chakraborty
- High Pressure & Synchroton Radiation Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.,Homi Bhabha National Institute, Trombay, Mumbai 400085, India.
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3
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Yoon Y, Truong PL, Lee D, Ko SH. Metal-Oxide Nanomaterials Synthesis and Applications in Flexible and Wearable Sensors. ACS NANOSCIENCE AU 2022; 2:64-92. [PMID: 37101661 PMCID: PMC10114907 DOI: 10.1021/acsnanoscienceau.1c00029] [Citation(s) in RCA: 39] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
Metal-oxide nanomaterials (MONs) have gained considerable interest in the construction of flexible/wearable sensors due to their tunable band gap, low cost, large specific area, and ease of manufacturing. Furthermore, MONs are in high demand for applications, such as gas leakage alarms, environmental protection, health tracking, and smart devices integrated with another system. In this Review, we introduce a comprehensive investigation of factors to boost the sensitivity of MON-based sensors in environmental indicators and health monitoring. Finally, the challenges and perspectives of MON-based flexible/wearable sensors are considered.
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Affiliation(s)
- Yeosang Yoon
- Applied
Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu,
Seoul 08826, Korea
| | - Phuoc Loc Truong
- Laser
and Thermal Engineering Lab, Department of Mechanical Engineering, Gachon University, Seongnam 13120, Korea
| | - Daeho Lee
- Laser
and Thermal Engineering Lab, Department of Mechanical Engineering, Gachon University, Seongnam 13120, Korea
| | - Seung Hwan Ko
- Applied
Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu,
Seoul 08826, Korea
- Institute
of Advanced Machinery and Design (SNU-IAMD), Seoul National University, Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
- Institute
of Engineering Research, Seoul National
University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
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4
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Banitaba SN, Ehrmann A. Application of Electrospun Nanofibers for Fabrication of Versatile and Highly Efficient Electrochemical Devices: A Review. Polymers (Basel) 2021; 13:1741. [PMID: 34073391 PMCID: PMC8197972 DOI: 10.3390/polym13111741] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 05/23/2021] [Accepted: 05/24/2021] [Indexed: 02/06/2023] Open
Abstract
Electrochemical devices convert chemical reactions into electrical energy or, vice versa, electricity into a chemical reaction. While batteries, fuel cells, supercapacitors, solar cells, and sensors belong to the galvanic cells based on the first reaction, electrolytic cells are based on the reversed process and used to decompose chemical compounds by electrolysis. Especially fuel cells, using an electrochemical reaction of hydrogen with an oxidizing agent to produce electricity, and electrolytic cells, e.g., used to split water into hydrogen and oxygen, are of high interest in the ongoing search for production and storage of renewable energies. This review sheds light on recent developments in the area of electrospun electrochemical devices, new materials, techniques, and applications. Starting with a brief introduction into electrospinning, recent research dealing with electrolytic cells, batteries, fuel cells, supercapacitors, electrochemical solar cells, and electrochemical sensors is presented. The paper concentrates on the advantages of electrospun nanofiber mats for these applications which are mostly based on their high specific surface area and the possibility to tailor morphology and material properties during the spinning and post-treatment processes. It is shown that several research areas dealing with electrospun parts of electrochemical devices have already reached a broad state-of-the-art, while other research areas have large space for future investigations.
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Affiliation(s)
| | - Andrea Ehrmann
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany
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5
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Sriphan S, Charoonsuk T, Khaisaat S, Sawanakarn O, Pharino U, Phunpruch S, Maluangnont T, Vittayakorn N. Flexible capacitive sensor based on 2D-titanium dioxide nanosheets/bacterial cellulose composite film. NANOTECHNOLOGY 2021; 32:155502. [PMID: 33401254 DOI: 10.1088/1361-6528/abd8ae] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this paper, titanium dioxide nanosheets (Ti0.91O2 NSs) were incorporated into bacterial cellulose (BC) film for dielectric property tuning while maintaining the flexibility of the resulting composite paper. By taking advantage of the improved dielectric constant, the nanosheets/BC composites were employed as capacitive sensors. The fabricated devices showed the highest sensing performance of ∼2.44 × 10-3 kPa-1 from 0 to 30 N when incorporating as little as 3 vol% of Ti0.91O2 NSs (or ∼2 wt% Ti). Stable operation and high robustness of the sensor were demonstrated, where simple human motions could be efficiently monitored. This study provided a route for preparing flexible and low-cost BC composite paper for capacitive sensor. The strategy for enhancing the dielectric properties as well as sensing performances of the BC demonstrated herein will be essential for the future development of biocompatible, low-cost, and eco-friendly wearable electronics.
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Affiliation(s)
- Saichon Sriphan
- Faculty of Science, Energy and Environment, King Mongkut's University of Technology North Bangkok, Rayong Campus, Rayong 21120, Thailand
- Advanced Material Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand
| | - Thitirat Charoonsuk
- Department of Materials Science, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand
| | - Supharada Khaisaat
- Advanced Material Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand
| | - Oubonwan Sawanakarn
- Advanced Material Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand
| | - Utchawadee Pharino
- Advanced Material Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand
| | - Saranya Phunpruch
- Department of Biology, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand
| | - Tosapol Maluangnont
- Electroceramics Research Laboratory, College of Nanotechnology, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand
| | - Naratip Vittayakorn
- Advanced Material Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand
- Department of Chemistry, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand
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6
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Abu Nayem SM, Shaheen Shah S, Sultana N, Aziz MA, Saleh Ahammad AJ. Electrochemical Sensing Platforms of Dihydroxybenzene: Part 1 – Carbon Nanotubes, Graphene, and their Derivatives. CHEM REC 2021; 21:1039-1072. [DOI: 10.1002/tcr.202100043] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 03/07/2021] [Indexed: 12/12/2022]
Affiliation(s)
- S. M. Abu Nayem
- Department of Chemistry Jagannath University Dhaka 1100 Bangladesh 9583794
| | - Syed Shaheen Shah
- Center of Research Excellence in Nanotechnology King Fahd University of Petroleum & Minerals, KFUPM Box 5040 Dhahran 31261 Saudi Arabia
- Physics Department King Fahd University of Petroleum & Minerals, KFUPM Box 5047 Dhahran 31261 Saudi Arabia
| | - Nasrin Sultana
- Department of Chemistry Jagannath University Dhaka 1100 Bangladesh 9583794
| | - Md. Abdul Aziz
- Center of Research Excellence in Nanotechnology King Fahd University of Petroleum & Minerals, KFUPM Box 5040 Dhahran 31261 Saudi Arabia
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Siafaka PI, Özcan Bülbül E, Dilsiz P, Karantas ID, Okur ME, Üstündağ Okur N. Detecting and targeting neurodegenerative disorders using electrospun nanofibrous matrices: current status and applications. J Drug Target 2021; 29:476-490. [PMID: 33269637 DOI: 10.1080/1061186x.2020.1859516] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Neurodegeneration is defined as the progressive atrophy and loss of function of neurons; it is present in neurodegenerative disorders such as Multiple Sclerosis, Alzheimer's, Huntington's, and Parkinson's diseases. The detection of such disorders is performed by various imaging modalities while their therapeutic management is quite challenging. Besides, the pathogenesis of neurodegenerative disorders is still under ongoing research due to complex and multi-factorial mechanisms. Currently, targeting the specific proteins responsible for neurodegeneration is of great interest to many researchers. Furthermore, nanotechnology-based approaches for targeting the affected neurons became an emerging field of interest. Nanostructures of various forms have been developed aiming to act as therapeutics for neurodegeneration, in which electrospun nanofibers seem to play an important role as biomedical products for both detection and management of the diseases. Electrospinning is an intriguing method able to produce nanofibers with a wide range of sizes and morphological characteristics. Such nanofibrous matrices can be delivered through different administration routes to target various diseases. In this review, the most recent advancements in electrospun nanofibrous systems that target or detect multiple neurodegenerative diseases have been enlightened and an introduction to the general aspects of neurodegenerative diseases and the electrospinning process has been made. Finally, future perspectives of neurodegeneration targeting were also discussed.
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Affiliation(s)
- Panoraia I Siafaka
- School of Chemistry, Faculty of Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Ece Özcan Bülbül
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Istinye University, Istanbul, Turkey
| | - Pelin Dilsiz
- Department of Physiology, School of Medicine, Regenerative and Restorative Medical Research Center (REMER), Istanbul Medipol University, Istanbul, Turkey.,Faculty of Pharmacy, Altınbaş University, Istanbul, Turkey
| | | | - Mehmet Evren Okur
- Department of Pharmacology, Faculty of Pharmacy, University of Health Sciences, Istanbul, Turkey
| | - Neslihan Üstündağ Okur
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Health Sciences, Istanbul, Turkey
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8
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Veeralingam S, Badhulika S. Bi2S3/PVDF/Ppy-Based Freestanding, Wearable, Transient Nanomembrane for Ultrasensitive Pressure, Strain, and Temperature Sensing. ACS APPLIED BIO MATERIALS 2020; 4:14-23. [DOI: 10.1021/acsabm.0c01399] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Sushmitha Veeralingam
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad Hyderabad, 502285, India
| | - Sushmee Badhulika
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad Hyderabad, 502285, India
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9
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Microwave radiation-assisted covalent functionalization of boron nitride nanotubes and their grafting with cationic thermo and pH-sensitive hydrogel. APPLIED NANOSCIENCE 2020. [DOI: 10.1007/s13204-020-01610-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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10
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Weerasinghe VT, Dissanayake DGK, Perera WPTD, Tissera ND, Wijesena RN, Wanasekara ND. All-organic, conductive and biodegradable yarns from core-shell nanofibers through electrospinning. RSC Adv 2020; 10:32875-32884. [PMID: 35516473 PMCID: PMC9056639 DOI: 10.1039/d0ra05430e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Accepted: 08/24/2020] [Indexed: 11/21/2022] Open
Abstract
Electrically conductive and biodegradable materials are desired for a range of applications in wearable electronics to address the growing ecological problem of e-waste. Herein, we report on the design and fabrication of all-organic, conductive and biodegradable nanofibrous core-shell yarn produced by in situ polymerization of aniline on the surface of electrospun poly(ε-caprolactone) nanofibers. The effect of concentration of aniline monomer on the morphology and resistivity of deposited polyaniline layer was investigated. The electrical resistance changed almost instantaneously with the strain for multiple stretch and recovery cycles. This rapid and sensitive response to mechanical loading and unloading is promising to validate the possibility of using the conductive yarns as strain sensors for monitoring human motion. Increasing the number of plies of yarn to three resulted in a three-fold reduction of the resistance. The twisted plied yarns were incorporated into fabric by stitching to demonstrate their use as a wearable electrode for capacitive sensors. This approach presents an early step in realizing all-organic conductive biodegradable nanofibrous yarns for biodegradable smart textiles.
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Affiliation(s)
| | | | - W Pamoda T D Perera
- Sri Lanka Institute of Nanotechnology (SLINTEC) Nanotechnology and Science Park, Mahenwatte, Pitipana Homagama 10200 Sri Lanka
| | - Nadeeka D Tissera
- Sri Lanka Institute of Nanotechnology (SLINTEC) Nanotechnology and Science Park, Mahenwatte, Pitipana Homagama 10200 Sri Lanka
| | - Ruchira N Wijesena
- Sri Lanka Institute of Nanotechnology (SLINTEC) Nanotechnology and Science Park, Mahenwatte, Pitipana Homagama 10200 Sri Lanka
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11
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Veeralingam S, Badhulika S. X (metal: Al, Cu, Sn, Ti)-functionalized tunable 2D-MoS 2 nanostructure assembled biosensor arrays for qualitative and quantitative analysis of vital neurological drugs. NANOSCALE 2020; 12:15336-15347. [PMID: 32648865 DOI: 10.1039/d0nr03427d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this work we report for the first time surface functionalization of 2D MoS2 with X (metals: Al, Cu, Sn, Ti) to develop a low-cost, ultra-selective biosensor array based Electronic Tongue (E-Tongue) for the detection of 4 vital neurological drugs in human saliva. The hydrothermally grown surface functionalized X-MoS2 was integrated onto a single 1 × 1 cm aluminium foil and contacts were defined using Cr electrodes. Detailed characterization revealed the formation of 2-H MoS2 and metal-X (Al, Cu, Sn, Ti)-functionalized MoS2 nanoflower like morphology decorated with nanoflake, nanorod, nanocube and nanostick structures, respectively. The response of the sensor array was recorded for aspirin, nicotine, caffeine and tramadol. Principal Component Analysis (PCA) was performed to reduce the dimension of numerous response data sets from all sensors and predict the likely possible response from various neurological drugs towards each sensor. Pattern-recognition analysis confirmed a definite pattern in response to respective functionalization and could efficiently differentiate neurological drugs from one another. Real-time analysis was performed using saliva samples for monitoring the therapeutic neurological drug concentration in the human body. Furthermore, the biosensor array was exposed to respective neurological drugs to study their sensitivity, selectivity, stability, reproducibility and adhesion onto the device. The strategy outlined can be used to develop lab-on-a-chip devices for the real-time detection of numerous bioanalytes in body fluids.
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Affiliation(s)
- Sushmitha Veeralingam
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, Hyderabad, 502285, India.
| | - Sushmee Badhulika
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, Hyderabad, 502285, India.
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12
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Veeralingam S, Badhulika S. Two-Dimensional Metallic NiSe 2 Nanoclusters-Based Low-Cost, Flexible, Amperometric Sensor for Detection of Neurological Drug Carbamazepine in Human Sweat Samples. Front Chem 2020; 8:337. [PMID: 32426327 PMCID: PMC7205447 DOI: 10.3389/fchem.2020.00337] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Accepted: 04/01/2020] [Indexed: 11/19/2022] Open
Abstract
Here we report a low-cost, flexible amperometric sensing platform for highly selective and sensitive detection of carbamazepine (CBZ) in human sweat samples. Detailed morphological characterization of the two-dimensional transition metal dichalcogenide NiSe2, synthesized using one-step hydrothermal method, confirms the formation of dense NiSe2 nanoclusters in the range of 500–650 nm, whereas X-ray diffraction and X-ray photoelectron spectroscopy studies reveal a stable and pure cubic crystalline phase of NiSe2. The sensor device is fabricated by uniformly depositing an optimized weight percentage of as-synthesized NiSe2 onto flexible and biocompatible polyimide substrate using spin coating, and metal contacts are established using thermal evaporation technique. The sensor exhibits a remarkable sensitivity of 65.65 μA/nM over a wide linear range of 50 nM to 10 μM CBZ concentrations and a low limit of detection of 18.2 nM. The sensing mechanism and excellent response of NiSe2 toward CBZ can be attributed to the highly conductive metallic NiSe2, large electroactive surface area of its nanoclusters, and highly interactive Ni2+/Ni3+ oxidation states. Furthermore, the presence of 10-fold excess of capable interferents, such as lactic acid, glucose, uric acid, and ascorbic acid, does not affect the accurate determination of CBZ, thus demonstrating excellent selectivity. The real-time detection of CBZ is evaluated in human sweat samples using standard addition method, which yields reliable results. Furthermore, the sensor shows excellent robustness when subject to bending cycles and fast response time of 2 s. The strategy outlined here is useful in developing sensing platforms at low potential without the use of enzymes or redox binders for applications in healthcare.
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Affiliation(s)
- Sushmitha Veeralingam
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, Hyderabad, India
| | - Sushmee Badhulika
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, Hyderabad, India
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13
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Veeralingam S, Yadav P, Badhulika S. An Fe-doped ZnO/BiVO 4 heterostructure-based large area, flexible, high-performance broadband photodetector with an ultrahigh quantum yield. NANOSCALE 2020; 12:9152-9161. [PMID: 32296793 DOI: 10.1039/c9nr10776b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Pristine ZnO has been widely explored for its use in UV photodetectors; however, the utility of ZnO in broadband photodetectors is still a challenge as it absorbs in the UV region only with low quantum efficiency and responsivity that can be accredited to the high recombination rate of photo-generated charge carriers. To address this issue, we report an Fe-doped 2D ZnO thin film, obtained through band gap engineering, and a 1D electrospun mixed-inorganic monoclinic BiVO4 nanofiber heterostructure on an ITO-coated PET substrate-based broadband photodetector (PD) with ultra-high responsivity and EQE values in comparison to PDs fabricated using expensive cleanroom techniques. BiVO4 plays the dual role of absorbing photons in the visible and NIR regions and creating local electric fields at the interface of the Fe-doped ZnO (FZO)-BiVO4 heterostructure, which helps in the separation of electron-hole pairs. The robustness of the flexible PD was further examined under the conditions of repeated bending cycles (up to 500), yielding a stable response. The responsivity values obtained for UV, visible and NIR irradiation are 7.35 A W-1, 3.8 A W-1 and 0.18 A W-1 with very high EQE values of 2501.7%, 851.2% and 28.3%, respectively. The facile and cost-effective fabrication of the device with high performance provides a new approach for developing flexible electronics and high-performance optoelectronic devices.
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Affiliation(s)
- Sushmitha Veeralingam
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, Hyderabad, 502285, India.
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