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Sol-gel assisted spin coated CdS/PS electrode based glucose biosensor
摘要： Excellent economic prospects and fascinating potential for basic research have led to many sensor designs and detection principles for biosensing of glucose. A novel electrochemical biosensor incorporating Cadmium Sulphide/Porous Silicon (CdS/PS) electrode to enhance electrochemical reaction has been investigated. CdS/PS electrode was fabricated and its electrochemical properties were studied by Cyclic voltammetry (CV), Electrochemical impedance spectroscopy (EIS) and Chronoamperometry. The result indicated that the CdS/PS electrode material has good electrochemical properties. The optimized sensor exhibits unique sensing performance towards glucose detection. The versatility of the sensor is shown by the detection limit down to 610 μM with a quick response time of 10 s and a good linear range from 10 to 100 mM. The results showed that the fabricated electrode was sensitive and stable in detecting glucose, indicating that CdS/PS electrode was a good candidate material for the design of glucose biosensor.
关键词： electrochemical studies,CdS/PS electrode,glucose biosensor
更新于2025-09-23 15:23:52
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Determination of prostate cancer biomarker acid phosphatase at a copper phthalocyanine-modified screen printed gold transducer
摘要： In this work, a novel sensor based on immobilized copper phthalocyanine, 2,9,16,23-tetracarboxylic acid-polyacrylamide (Cu(II)TC Pc-PAA) was developed for determination of acid phosphatase (ACP) levels in nanomolar quantities. Detection was based on the measurement of enzymatically generated phosphate, with initial studies focused on phosphate detection at a Cu(II)TC Pc-PAA modified screen-printed gold transducer. The sensor was characterised in relation to operational performance (pH, response time, stability, linearity, and sensitivity) and common anionic interferents (nitrate, sulphate, chloride, and perchlorate). The functionalised surface also facilitated rapid detection of the enzyme bi-product 2-naphthol over the range 5-3000 μM. Quantitation of ACP was demonstrated, realising a linear response range of 0.5-20 nM and LOD of 0.5 nM, which is within the clinical range for this prostate cancer biomarker.
关键词： phosphate,Copper phthalocyanine,acid phosphatase,naphthol,gold screen-printed electrode.
更新于2025-09-23 15:23:52
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Behavior of Al/Cu/Ti electrodes in surface acoustic wave filter at high power
摘要： Driven by the need for high data-rates and continuous reduction in device size, surface acoustic wave filters are required to work under increasingly high power. In this work, a series of 2.7 GHz surface acoustic wave filters with Al/Cu/Ti three-layered electrode were fabricated and loaded with high power. Those three-layered electrodes showed weaker texture but higher stability than Al-Cu alloy electrode at high power. Morphologies, microstructures and elements distribution in cross section of fingers were analyzed carefully before and after high power loading. Results show that the circular-arc-shaped outline of fingers were appeared in most samples after high power loading, and the number of gains in the finger cross section changed from some into several with much larger volume. The features of distribution of Cu atoms also coincided with these microstructures. By finite element method and phase diagram analysis, the higher stability of Al/Cu/Ti three-layered electrodes are attributed to precipitation of θ-CuAl2 in the bottom edge of electrode finger and Cu-doped α-Al in the center top.
关键词： stress,Al-Cu alloy,high power,surface acoustic wave filter,three-layered electrode
更新于2025-09-23 15:23:52
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A label-free aptamer-based nanogap capacitive biosensor with greatly diminished electrode polarization effects
摘要： A significant impediment to the use of impedance spectroscopy in bio-sensing is the electrode polarization effect that arises from the movement of free ions to the electrode–solution interface, forming an electrical double layer (EDL). The EDL screens the dielectric response of the bulk and its large capacitance dominates the signal response at low frequency, masking information particularly relevant for biological samples, such as molecular conformation changes and DNA hybridization. The fabrication of nanogap capacitors with electrode separation less than the EDL thickness can significantly reduce electrode polarization effects and provide enormous improvement in sensitivity due to better matching of the sensing volume with the size of the target entities. We report on the fabrication of a horizontal thin-film nanogap capacitive sensor with electrode separation of 40 nm that shows almost no electrode polarization effects when measured with water and ionic buffer solutions, thereby allowing direct quantification of their relative permittivity at low frequencies. Surface modification of the electrodes with thiol-functionalized single strand DNA aptamers transforms the device into a label-free biosensor with high sensitivity and selectivity towards the detection of a specific protein. Using this approach, we have developed a biosensor for the detection of human alpha thrombin. In addition, we also examine frequency dependent permittivity measurements on high ionic strength solutions contained within the nanogap and discuss how these support recent experimental observations of large Debye lengths. A large shift in the Debye relaxation frequency to lower frequency is also found, which is consistent with water molecules being in a rigid-like state, possibly indicating the formation of an ordered ‘‘ice-like’’ phase. Altogether, this work highlights the need for better understanding of fluids in confined, nanoscale geometries, from which important new applications in sensing may arise.
关键词： electrode polarization,aptamer,nanogap,capacitive biosensor,dielectric spectroscopy,thrombin
更新于2025-09-23 15:23:52
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Step-shaped electrode for low-voltage and high-optical-efficiency blue-phase transflective liquid crystal displays
摘要： A step-shaped electrode design is proposed for Polymer Stabilised Blue Phase (PSBP) Transflective LCD (TR-LCD). This new electrode design is capable of delivering very high optical efficiency (both T and R) of >95% with operation voltage of ~13 V (or >~90% with ~9 V). The step-shaped electrode helps generate strong horizontal electric fields across the whole cell and suppress the formation of dead zone.
关键词： transflective,Liquid crystal display,step-shaped electrode,blue phase
更新于2025-09-23 15:23:52
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Highly conductive, transparent and metal-free electrodes with a PEDOT:PSS/SWNT bilayer for high-performance organic thin film transistors
摘要： Conductive organic materials including polymers, small molecules, and carbon nanotubes (CNTs) are a promising alternative to inorganic materials in electronic devices. Conventionally, organic electrodes employing CNTs are designed using functionalization of their surfaces or formation of nanocomposites with a conductive polymer. However, phase separation limits the concentration of CNTs in a polymer matrix, hindering the formation of highly dense CNT networks and leading to poor electrical conductivity. In this paper, we introduce bilayer electrodes comprising poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and single-walled CNTs (SWNTs) chemically modified by HNO3 treatment. Impressive conductivities of 2432 and 2438 S cm?1 are found for the SWNT/PEDOT:PSS (S/P) and PEDOT:PSS/SWNT (P/S) electrodes, respectively. Further, an increase in the work function of the electrodes after HNO3 treatment lowers the hole injection barrier, which facilitates hole injection from pentacene. The smooth surface of PEDOT:PSS also contributes to growth of large pentacene grains; consequently, the field-effect mobility of pentacene-based thin film transistors is 1.88 cm2 V?1 s?1 when the P/S electrode is employed. The metal-free electrodes also exhibit a high optical transparency of 88.7%, which suggests that they have great potential for applications in optoelectronics.
关键词： Electrode,PEDOT:PSS,Carbon nanotube,Pentacene,Thin film transistor
更新于2025-09-23 15:23:52
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Research of Single-Event Burnout and Hardening of AlGaN/GaN-Based MISFET
摘要： This brief ?rst time presents single-event burnout (SEB) simulation results for conventional AlGaN/GaN gate ?eld plate MISFET (GFP-C MISFET), simultaneously, a hardened MISFET with electrode connected doped plugs in the buffer (EC-DP MISFET) is proposed for the ?rst time. The SEB triggering mechanisms contain the back-channel effect and following impact ionization dominated by electron in the high ?eld region. By comparing the simulation results from the GFP-C MISFET and proposed hardened EC-DP MISFET, the carriers induced by heavy ion can be quickly absorbed to drain and source electrode through EC-DP, so that the proposed EC-DP MISFET can achieve better SEB performance than conventional one. With a heavy ion having the linear energy transfer value of 0.6-pC/μm striking vertically, SEB threshold voltage obtained in GFP-C MISFET and hardened EC-DP MISFET is 280 and 338 V, respectively.
关键词： MISFET,single-event burnout (SEB) hardening,SEB,technology computer-aided design (TCAD),Electrode connected doped plugs (EC-DP)
更新于2025-09-23 15:23:52
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Highly Flexible and Transparent Memristive Devices using Cross-Stacked Oxide/Metal/Oxide Electrode Layers
摘要： Flexible and transparent memristive devices (FT-memristors) are considered to be among promising candidates for future nonvolatile memories. To realize these devices, it is essential to achieve flexible and transparent conductive electrodes (TCEs). However, conventionally-used TCEs such as indium tin oxide, gallium zinc oxide, and indium zinc oxide are not so flexible and even necessitate thermal annealing for high conductivity and optical transmittance. Here, we introduce Ag/ZnO/Ag and Ag/Al2O3/Ag-based FT memristors using cross-stacked oxide/metal/oxide electrode layers (i.e., ZnO/Ag/ZnO + ZnO/Ag/ZnO and Al2O3/Ag/Al2O3 + Al2O3/Ag/Al2O3) without using any annealing process on polyethylene terephthalate substrates (PETs). Both Ag/ZnO/Ag- and Ag/Al2O3/Ag-based FT-memristors on PETs exhibited excellent properties, including high transmittance (> 86% in the visible region), high ON/OFF current ratios (> 103), and long retention times (> 105 s). In addition, they showed very stable and flexible characteristics on PETs even after 2500 bending cycles with a bending radius of 8.1 mm. Finally, we analyzed transmission electron microscopy images and time-of-flight secondary ion mass spectroscopy profiles to identify switching mechanisms in these devices.
关键词： Al2O3/Ag/Al2O3,filament,memristive device,Transparent and flexible electrode,ZnO/Ag/ZnO
更新于2025-09-23 15:23:52
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Study of the relationship between metal-assisted chemical etching and direction of the applied electric field
摘要： Metal-assisted chemical etching (MACE) has been proposed as a promising alternative for the fabrication of micro/nano-structures on silicon with simple process and low cost. Electric field can be applied during the reaction to control the motion of charged particles so as to accelerate the reaction and form uniform vertical trenches with high aspect ratio. In this paper, boron doped p-type (100) silicon wafers with resistivity of 20～30 Ω·cm was used as substrates. After coated with layers of 5 nm Ti and 10 nm Au, the silicon substrate was immersed into the etchant containing hydrofluoric acid (HF) and hydrogen peroxide (H2O2) with high HF-to-H2O2 concentration ratio (ρ) and an applied voltage of 40 volts. It was found that the direction of the applied electric field had a great influence on morphologies of the trenches. Deeper trenches with vertical sidewalls and relatively smoother bottom were observed when silicon substrate was connected to cathode of the power supply. Possible interpretation to these phenomena was proposed, and the effect of the electric field intensity and doping concentration was further studied.
关键词： trench morphology,metal-assisted chemical etching,electric field,HF-to-H2O2 ratio,electrode connection
更新于2025-09-23 15:23:52
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[IEEE 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Shanghai (2018.8.8-2018.8.11)] 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - A cost-effective and high performance assembly technology for interconnecting the Cu/Al bilayer electrode and lead wire of ZnO varistor using a low Ag-containing solder paste
摘要： In this paper, the spreading ability of solder pastes with different Ag contents on Ag and Cu/Al bilayer electrodes was investigated in detail. The mechanical performance (i.e., stripping force) and microstructure of 'lead-wire/solder/electrode/ZnO' joints were characterized. The electrical property of ZnO varistors soldered by various solder pastes was also analysed. Results show that the low Ag-containing solder paste with the assistance of the flux having appropriate activity exhibits similar spreading ability on Ag and Cu/Al bilayer electrodes with the high Ag-containing solder paste. Moreover, the difference in Ag content of solder pastes has little influence on the stripping force of the solder joints and the surge performance of ZnO varistors. High activity of the solder paste may lead to severe corrosion of Ag electrode and decrease in the stripping force of the joints, and low activity of the solder paste brings the problem of inadequate removal of oxide films on the Cu/Al bilayer electrode, which leads to poor soldering quality and lower stripping force of the joints. ZnO varistors with Cu/Al bilayer electrodes have superior surge performance over those with Ag electrodes.
关键词： Cu/Al bilayer electrode,ZnO varistor,mechanical performance,spreading ability,low Ag-containing solder paste
更新于2025-09-23 15:22:29