1
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Kao CH, Chen KL, Chen JR, Chen SM, Kuo YW, Lee ML, Lee LJH, Chen H. Comparison of Magnesium and Titanium Doping on Material Properties and pH Sensing Performance on Sb 2O 3 Membranes in Electrolyte-Insulator-Semiconductor Structure. MEMBRANES 2021; 12:25. [PMID: 35054551 PMCID: PMC8779276 DOI: 10.3390/membranes12010025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 12/22/2021] [Accepted: 12/22/2021] [Indexed: 11/23/2022]
Abstract
In this research, electrolyte-insulator-semiconductor (EIS) capacitors with Sb2O3 sensing membranes were fabricated. The results indicate that Mg doping and Ti-doped Sb2O3 membranes with appropriate annealing had improved material quality and sensing performance. Multiple material characterizations and sensing measurements of Mg-doped and Ti doping on Sb2O3 sensing membranes were conducted, including of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). These detailed studies indicate that silicate and defects in the membrane could be suppressed by doping and annealing. Moreover, compactness enhancement, crystallization and grainization, which reinforced the surface sites on the membrane and boosted the sensing factor, could be achieved by doping and annealing. Among all of the samples, Mg doped membrane with annealing at 400 °C had the most preferable material properties and sensing behaviors. Mg-doped Sb2O3-based with appropriate annealing are promising for future industrial ionsensing devices and for possible integration with Sb2O3-based semiconductor devices.
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Affiliation(s)
- Chyuan-Haur Kao
- Department of Electronic Engineering, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan District, Tao Yuan City 333, Taiwan; (C.-H.K.); (K.-L.C.)
- Kidney Research Center, Department of Nephrology, Chang Gung Memorial Hospital, Chang Gung University, No. 5 Fuxing St., Guishan District, Taoyuan City 333, Taiwan
- Department of Electronic Engineering, Ming Chi University of Technology, 284 Gungjuan Rd., Taishan Dist., New Taipei City 243, Taiwan
| | - Kuan-Lin Chen
- Department of Electronic Engineering, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan District, Tao Yuan City 333, Taiwan; (C.-H.K.); (K.-L.C.)
| | - Jun-Ru Chen
- Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Puli 545, Taiwan; (J.-R.C.); (S.-M.C.)
| | - Shih-Ming Chen
- Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Puli 545, Taiwan; (J.-R.C.); (S.-M.C.)
| | - Yaw-Wen Kuo
- Department of Electrical Engineering, National Chi Nan University, Puli 545, Taiwan;
| | - Ming-Ling Lee
- Department of Electro-Optical Enginnering, Minghsin University of Science and Technology, No.1, Xinxing Rd., Xinfeng 304, Taiwan
| | - Lukas Jyuhn-Hsiarn Lee
- National Institute of Environmental Health Sciences, National Health Research Institutes, Zhunan 350, Taiwan;
| | - Hsiang Chen
- Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Puli 545, Taiwan; (J.-R.C.); (S.-M.C.)
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2
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Poghossian A, Schöning MJ. Capacitive Field-Effect EIS Chemical Sensors and Biosensors: A Status Report. SENSORS 2020; 20:s20195639. [PMID: 33023133 PMCID: PMC7584023 DOI: 10.3390/s20195639] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 09/21/2020] [Accepted: 09/29/2020] [Indexed: 02/07/2023]
Abstract
Electrolyte-insulator-semiconductor (EIS) field-effect sensors belong to a new generation of electronic chips for biochemical sensing, enabling a direct electronic readout. The review gives an overview on recent advances and current trends in the research and development of chemical sensors and biosensors based on the capacitive field-effect EIS structure—the simplest field-effect device, which represents a biochemically sensitive capacitor. Fundamental concepts, physicochemical phenomena underlying the transduction mechanism and application of capacitive EIS sensors for the detection of pH, ion concentrations, and enzymatic reactions, as well as the label-free detection of charged molecules (nucleic acids, proteins, and polyelectrolytes) and nanoparticles, are presented and discussed.
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Affiliation(s)
- Arshak Poghossian
- MicroNanoBio, Liebigstr. 4, 40479 Düsseldorf, Germany
- Correspondence: (A.P.); (M.J.S.)
| | - Michael J. Schöning
- Institute of Nano- and Biotechnologies (INB), FH Aachen, Campus Jülich, Heinrich-Mußmannstr. 1, 52428 Jülich, Germany
- Correspondence: (A.P.); (M.J.S.)
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3
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Cho H, Kim K, Kwak HT, Lee S, Meyyappan M, Baek CK. Buffer solution optimization for accurate fluoride ion detection in tap water. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.113837] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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4
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Bronder TS, Jessing MP, Poghossian A, Keusgen M, Schöning MJ. Detection of PCR-Amplified Tuberculosis DNA Fragments with Polyelectrolyte-Modified Field-Effect Sensors. Anal Chem 2018; 90:7747-7753. [PMID: 29770694 DOI: 10.1021/acs.analchem.8b01807] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Field-effect-based electrolyte-insulator-semiconductor (EIS) sensors were modified with a bilayer of positively charged weak polyelectrolyte (poly(allylamine hydrochloride) (PAH)) and probe single-stranded DNA (ssDNA) and are used for the detection of complementary single-stranded target DNA (cDNA) in different test solutions. The sensing mechanism is based on the detection of the intrinsic molecular charge of target cDNA molecules after the hybridization event between cDNA and immobilized probe ssDNA. The test solutions contain synthetic cDNA oligonucleotides (with a sequence of tuberculosis mycobacteria genome) or PCR-amplified DNA (which origins from a template DNA strand that has been extracted from Mycobacterium avium paratuberculosis-spiked human sputum samples), respectively. Sensor responses up to 41 mV have been measured for the test solutions with DNA, while only small signals of ∼5 mV were detected for solutions without DNA. The lower detection limit of the EIS sensors was ∼0.3 nM, and the sensitivity was ∼7.2 mV/decade. Fluorescence experiments using SybrGreen I fluorescence dye support the electrochemical results.
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Affiliation(s)
- Thomas S Bronder
- Institute of Nano- and Biotechnologies , FH Aachen , Campus Jülich , 52428 Jülich , Germany.,Institute of Complex Systems Bioelectronics (ICS-8) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
| | - Max P Jessing
- Institute of Nano- and Biotechnologies , FH Aachen , Campus Jülich , 52428 Jülich , Germany
| | - Arshak Poghossian
- Institute of Nano- and Biotechnologies , FH Aachen , Campus Jülich , 52428 Jülich , Germany.,Institute of Complex Systems Bioelectronics (ICS-8) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
| | - Michael Keusgen
- Institute of Pharmaceutical Chemistry , Philipps University Marburg , 35037 Marburg , Germany
| | - Michael J Schöning
- Institute of Nano- and Biotechnologies , FH Aachen , Campus Jülich , 52428 Jülich , Germany.,Institute of Complex Systems Bioelectronics (ICS-8) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
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5
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Rodrigues RT, Morais PV, Nordi CSF, Schöning MJ, Siqueira JR, Caseli L. Carbon Nanotubes and Algal Polysaccharides To Enhance the Enzymatic Properties of Urease in Lipid Langmuir-Blodgett Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:3082-3093. [PMID: 29397738 DOI: 10.1021/acs.langmuir.7b04317] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Algal polysaccharides (extracellular polysaccharides) and carbon nanotubes (CNTs) were adsorbed on dioctadecyldimethylammonium bromide Langmuir monolayers to serve as a matrix for the incorporation of urease. The physicochemical properties of the supramolecular system as a monolayer at the air-water interface were investigated by surface pressure-area isotherms, surface potential-area isotherms, interfacial shear rheology, vibrational spectroscopy, and Brewster angle microscopy. The floating monolayers were transferred to hydrophilic solid supports, quartz, mica, or capacitive electrolyte-insulator-semiconductor (EIS) devices, through the Langmuir-Blodgett (LB) technique, forming mixed films, which were investigated by quartz crystal microbalance, fluorescence spectroscopy, and field emission gun scanning electron microscopy. The enzyme activity was studied with UV-vis spectroscopy, and the feasibility of the thin film as a urea sensor was essayed in an EIS sensor device. The presence of CNT in the enzyme-lipid LB film not only tuned the catalytic activity of urease but also helped to conserve its enzyme activity. Viability as a urease sensor was demonstrated with capacitance-voltage and constant capacitance measurements, exhibiting regular and distinctive output signals over all concentrations used in this work. These results are related to the synergism between the compounds on the active layer, leading to a surface morphology that allowed fast analyte diffusion owing to an adequate molecular accommodation, which also preserved the urease activity. This work demonstrates the feasibility of employing LB films composed of lipids, CNT, algal polysaccharides, and enzymes as EIS devices for biosensing applications.
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Affiliation(s)
- Raul T Rodrigues
- Institute of Environmental, Chemical and Pharmaceutical Sciences , Federal University of São Paulo (UNIFESP) , 09913-030 Diadema , São Paulo , Brazil
| | - Paulo V Morais
- Institute of Exact Sciences, Natural and Education , Federal University of Triângulo Mineiro (UFTM) , 38064-200 Uberaba , Minas Gerais , Brazil
- Interdisciplinary Laboratory of Electrochemistry and Ceramics, Chemistry Institute , São Paulo State University , 14800-900 Araraquara , São Paulo , Brazil
| | - Cristina S F Nordi
- Institute of Environmental, Chemical and Pharmaceutical Sciences , Federal University of São Paulo (UNIFESP) , 09913-030 Diadema , São Paulo , Brazil
| | - Michael J Schöning
- Institute of Nano- and Biotechnologies (INB) , FH Aachen, Campus Jülich , 52428 Jülich , Germany
- Institute of Complex Systems (ICS-8) , Forschungszentrum Jülich , 52425 Jülich , Germany
| | - José R Siqueira
- Institute of Exact Sciences, Natural and Education , Federal University of Triângulo Mineiro (UFTM) , 38064-200 Uberaba , Minas Gerais , Brazil
| | - Luciano Caseli
- Institute of Environmental, Chemical and Pharmaceutical Sciences , Federal University of São Paulo (UNIFESP) , 09913-030 Diadema , São Paulo , Brazil
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6
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Park S, Rittman DR, Tracy CL, Chapman KW, Zhang F, Park C, Tkachev SN, O'Quinn E, Shamblin J, Lang M, Mao WL, Ewing RC. A 2TiO 5 (A = Dy, Gd, Er, Yb) at High Pressure. Inorg Chem 2018; 57:2269-2277. [PMID: 29420026 DOI: 10.1021/acs.inorgchem.7b03106] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structural evolution of lanthanide A2TiO5 (A = Dy, Gd, Yb, Er) at high pressure is investigated using synchrotron X-ray diffraction. The effects of A-site cation size and of the initial structure are systematically examined by varying the composition of the isostructural lanthanide titanates and the structure of dysprosium titanate polymorphs (orthorhombic, hexagonal, and cubic), respectively. All samples undergo irreversible high-pressure phase transformations, but with different onset pressures depending on the initial structure. While each individual phase exhibits different phase transformation histories, all samples commonly experience a sluggish transformation to a defect cotunnite-like (Pnma) phase for a certain pressure range. Orthorhombic Dy2TiO5 and Gd2TiO5 form P21am at pressures below 9 GPa and Pnma above 13 GPa. Pyrochlore-type Dy2TiO5 and Er2TiO5 as well as defect-fluorite-type Yb2TiO5 form Pnma at ∼21 GPa, followed by Im3̅m. Hexagonal Dy2TiO5 forms Pnma directly, although a small amount of remnants of hexagonal Dy2TiO5 is observed even at the highest pressure (∼55 GPa) reached, indicating kinetic limitations in the hexagonal Dy2TiO5 phase transformations at high pressure. Decompression of these materials leads to different metastable phases. Most interestingly, a high-pressure cubic X-type phase (Im3̅m) is confirmed using high-resolution transmission electron microscopy on recovered pyrochlore-type Er2TiO5. The kinetic constraints on this metastable phase yield a mixture of both the X-type phase and amorphous domains upon pressure release. This is the first observation of an X-type phase for an A2BO5 composition at high pressure.
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Affiliation(s)
- Sulgiye Park
- Department of Geological Science, Stanford University , Stanford, California 94305, United States
| | - Dylan R Rittman
- Department of Geological Science, Stanford University , Stanford, California 94305, United States
| | - Cameron L Tracy
- Department of Geological Science, Stanford University , Stanford, California 94305, United States
| | - Karena W Chapman
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Fuxiang Zhang
- Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Changyong Park
- HPCAT, Carnegie Institution of Washington , Argonne, Illinois 60439, United States
| | - Sergey N Tkachev
- Center for Advanced Radiation Sources, University of Chicago , Chicago, Illinois 60637, United States
| | - Eric O'Quinn
- Department of Nuclear Engineering, University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Jacob Shamblin
- Department of Nuclear Engineering, University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Maik Lang
- Department of Nuclear Engineering, University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Wendy L Mao
- Department of Geological Science, Stanford University , Stanford, California 94305, United States.,Stanford Institute for Materials & Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States
| | - Rodney C Ewing
- Department of Geological Science, Stanford University , Stanford, California 94305, United States
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7
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Swift-heavy ion irradiation response and annealing behavior of A2TiO5 (A = Nd, Gd, and Yb). J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2017.09.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Tian FY, Yang F, Jiang XQ, Wu Q, Wang J. Syntheses, structural determination, and binding studies of binuclear nine-coordinate (MnH)4[Ho
2
III
(Dtpa)2] · 12H2O and polynuclear nine-coordinate {(MnH)[HoIII(Egta)] · 3H2O}
n. RUSS J COORD CHEM+ 2017. [DOI: 10.1134/s1070328417070089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Piccinini E, Bliem C, Reiner-Rozman C, Battaglini F, Azzaroni O, Knoll W. Enzyme-polyelectrolyte multilayer assemblies on reduced graphene oxide field-effect transistors for biosensing applications. Biosens Bioelectron 2016; 92:661-667. [PMID: 27836616 DOI: 10.1016/j.bios.2016.10.035] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 09/28/2016] [Accepted: 10/18/2016] [Indexed: 01/27/2023]
Abstract
We present the construction of layer-by-layer (LbL) assemblies of polyethylenimine and urease onto reduced-graphene-oxide based field-effect transistors (rGO FETs) for the detection of urea. This versatile biosensor platform simultaneously exploits the pH dependency of liquid-gated graphene-based transistors and the change in the local pH produced by the catalyzed hydrolysis of urea. The use of an interdigitated microchannel resulted in transistors displaying low noise, high pH sensitivity (20.3µA/pH) and transconductance values up to 800 µS. The modification of rGO FETs with a weak polyelectrolyte improved the pH response because of its transducing properties by electrostatic gating effects. In the presence of urea, the urease-modified rGO FETs showed a shift in the Dirac point due to the change in the local pH close to the graphene surface. Markedly, these devices operated at very low voltages (less than 500mV) and were able to monitor urea in the range of 1-1000µm, with a limit of detection (LOD) down to 1µm, fast response and good long-term stability. The urea-response of the transistors was enhanced by increasing the number of bilayers due to the increment of the enzyme surface coverage onto the channel. Moreover, quantification of the heavy metal Cu2+(with a LOD down to 10nM) was performed in aqueous solution by taking advantage of the urease specific inhibition.
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Affiliation(s)
- Esteban Piccinini
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) - Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata - CONICET, Suc. 4, CC 16, La Plata, Argentina
| | - Christina Bliem
- Centre of Electrochemical Surface Technology (CEST), Viktor-Kaplan-Straße 2, 2700 Wiener Neustadt, Austria
| | - Ciril Reiner-Rozman
- AIT Austrian Institute of Technology, Donau City Straße 1, 1220 Vienna, Austria
| | - Fernando Battaglini
- INQUIMAE, Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina
| | - Omar Azzaroni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) - Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata - CONICET, Suc. 4, CC 16, La Plata, Argentina.
| | - Wolfgang Knoll
- AIT Austrian Institute of Technology, Donau City Straße 1, 1220 Vienna, Austria
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10
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Crystal chemistry of the orthorhombic Ln2TiO5 compounds with Ln=La, Pr, Nd, Sm, Gd, Tb and Dy. J SOLID STATE CHEM 2015. [DOI: 10.1016/j.jssc.2015.03.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Siqueira JR, Molinnus D, Beging S, Schöning MJ. Incorporating a Hybrid Urease-Carbon Nanotubes Sensitive Nanofilm on Capacitive Field-Effect Sensors for Urea Detection. Anal Chem 2014; 86:5370-5. [DOI: 10.1021/ac500458s] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- José R. Siqueira
- Institute
of Exact Sciences, Naturals and Education, Federal University of Triângulo Mineiro (UFTM), 38064-200 Uberaba, Brazil
| | - Denise Molinnus
- Institute
of Nano- and Biotechnologies (INB), FH Aachen, Campus Jülich, 52428 Jülich, Germany
| | - Stefan Beging
- Institute
of Nano- and Biotechnologies (INB), FH Aachen, Campus Jülich, 52428 Jülich, Germany
| | - Michael J. Schöning
- Institute
of Nano- and Biotechnologies (INB), FH Aachen, Campus Jülich, 52428 Jülich, Germany
- Peter
Grünberg Institute (PGI-8), Forschungszentrum Jülich, 52425 Jülich, Germany
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12
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Wu MH, Yang HW, Hua MY, Peng YB, Pan TM. High-κ GdTixOy sensing membrane-based electrolyte-insulator-semiconductor with magnetic nanoparticles as enzyme carriers for protein contamination-free glucose biosensing. Biosens Bioelectron 2013; 47:99-105. [PMID: 23567628 DOI: 10.1016/j.bios.2013.03.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2012] [Revised: 02/19/2013] [Accepted: 03/08/2013] [Indexed: 12/01/2022]
Abstract
This paper reports an electrolyte-insulator-semiconductor (EIS) device featuring a novel high-κ GdTixOy sensing membrane for high-performance pH sensing and glucose biosensing. The effect of the annealing temperature (700, 800, or 900°C) on the sensing properties of the GdTixOy membranes was investigated. The GdTixOy EIS device annealed at 900°C exhibited the greatest pH sensing performance, including the highest sensitivity (62.12mV/pH), the smallest hysteresis voltage (5mV), and the lowest drift rate (0.4mV/h), presumably because of its well-crystallized GdTixOy structure. To overcome the problems typically encountered during the practical application of biosensors (e.g., protein adsorption; preservation of enzymatic activity), we employed Fe3O4-based magnetic nanoparticles (MNPs) as enzyme carriers. The adsorption of serum protein on the unmodified sensing membrane led to poor EIS-based pH sensing (r(2)=0.71); the performance was greatly improved, however, after attaching the MNPs to the sensing membrane, thereby blocking protein adsorption significantly (by 98%) and allowing excellent pH sensing (r(2)=0.99). Moreover, we prepared a hybrid configuration of the proposed GdTixOy membrane-EIS, with magnetically attached glucose oxidase-immobilized MNPs, for glucose biosensing. The use of MNPs as enzyme carriers effectively preserved the enzymatic activity of glucose oxidase, with 45.3% of the original enzymatic activity retained after 120h of storage at 4°C (compared with complete loss of the free enzyme's activity under the same storage conditions). In addition, the proposed biosensor exhibited superior detection sensitivity of 11.03mV/mM relative to that (8.17mV/mM) obtained using the conventional enzyme immobilization method. Finally, we established the accuracy of the proposed method for blood glucose measurement; gratifyingly, blood glucose detection was comparable with the high-sensitivity glucose quantification obtained using a commercial glucose assay kit.
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Affiliation(s)
- Min-Hsien Wu
- Graduate Institute of Biochemical and Biomedical Engineering, Chang Gung University, Kwei-Shan, Tao-Yuan 33302, Taiwan
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13
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Gao JQ, Wu T, Wang J, Bai Y, Wang SJ, Xu YN, Li Y, Zhang XD. Syntheses, spectroscopic analysis, and structural determination of two novel nine-coordinate mononuclear Na4[EuIII(Dtpa)(H2O)]2 · 11.5H2O and binuclear (NH4)4[EuIII(Dtpa)]2 · 10H2O complexes. RUSS J COORD CHEM+ 2012. [DOI: 10.1134/s1070328412060048] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Wang J, Hu P, Liu B, Chen X, Zhang LQ, Han GX, Xu R, Zhang XD. Mononuclear nine-coordinate Na[SmIII(edta)(H2O)3] · 5H2O and one dimensional unlimited ladderlike eight-coordinate {[SmIII(Hpdta)(H2O)] · 2H2}O n Complexes: Synthesis and Structural Determination. RUSS J INORG CHEM+ 2010. [DOI: 10.1134/s003602361010013x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Lin TW, Kekuda D, Chu CW. Label-free detection of DNA using novel organic-based electrolyte-insulator-semiconductor. Biosens Bioelectron 2010; 25:2706-10. [PMID: 20483584 DOI: 10.1016/j.bios.2010.04.041] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2010] [Revised: 04/26/2010] [Accepted: 04/27/2010] [Indexed: 10/19/2022]
Abstract
In this study, we have constructed the first organic field effect sensor based on an electrolyte-insulator-semiconductor structure (OEIS) and applied this novel device to pH and DNA sensing. Variations in the insulator-electrolyte surface potential, which originate from either the change of the ionization states of the insulator surface groups or the binding of charged molecules to the insulator surface, modify the flat band voltage (V(FB)) of the OEIS sensor. The pH sensing experiments of OEIS sensor showed that the output signal linearly depended on pH solution in the range from pH 2 to pH 12, and an average sensitivity of 44.1 mV/pH was obtained. In the biosensing experiments, the absorption of positively charged poly-L-lysine on the insulator surface resulted in the reduction of the V(FB) value, whereas the subsequent binding of negatively charged single-stranded DNA probe (ssDNA) via electrostatic interaction increased the V(FB) value. Furthermore, the ssDNA-immobilized OEIS device was successfully used for the detection of DNA hybridization. The detection limit of complementary DNA was as low as 1 microM, and the output signal of OEIS biosensor linearly increased with the logarithm of complementary DNA concentration in the range from 5x10(-5) to 10(-7) M. The easy and inexpensive fabrication of the OEIS device allows to be served as a potentially disposable and sensitive biosensor.
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Affiliation(s)
- Tsung-Wu Lin
- Research Center for Applied Sciences, Academia Sinica, Nankang, Taipei, Taiwan
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