Sylvia Thomas

Dr. Sylvia Thomas

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Academic Career Length

15Years (2012-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 August 2021 in Biosensors and Bioelectronics
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Journal Article
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KPKavyashree Puttananjegowda
Kavyashree Puttananjegowda
ATArash Takshi
Arash Takshi
STSylvia Thomas
Sylvia Thomas
1 February 2023 in Sensors
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William Serrano-GarciaWilliam Serrano-Garcia
William Serrano-Garcia
IBIrene Bonadies
Irene Bonadies
STSylvia Thomas
Sylvia Thomas
Vincenzo GuarinoVincenzo Guarino
Vincenzo Guarino
Fiber electronics, such as those produced by the electrospinning technique, have an extensive range of applications including electrode surfaces for batteries and sensors, energy storage, electromagnetic interference shielding, antistatic coatings, catalysts, drug delivery, tissue engineering, and smart textiles. New composite materials and blends from conductive–semiconductive polymers (C-SPs) offer high surface area-to-volume ratios with electrical tunability, making them suitable for use in fields including electronics, biofiltration, tissue engineering, biosensors, and “green polymers”. These materials and structures show great potential for embedded-electronics tissue engineering, active drug delivery, and smart biosensing due to their electronic transport behavior and mechanical flexibility with effective biocompatibility. Doping, processing methods, and morphologies can significantly impact the properties and performance of C-SPs and their composites. This review provides an overview of the current literature on the processing of C-SPs as nanomaterials and nanofibrous structures, mainly emphasizing the electroactive properties that make these structures suitable for various applications.
22 November 2022 in Polymers
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William Serrano-GarciaWilliam Serrano-Garcia
William Serrano-Garcia
Seeram RamakrishnaSeeram Ramakrishna
Seeram Ramakrishna
STSylvia Thomas
Sylvia Thomas
In this work, the electrospinning technique is used to fabricate a polymer-polymer coaxial structure nanofiber from the p-type regioregular polymer poly(3-hexylthiophene-2,5-diyl) (P3HT) and the n-type conjugated ladder polymer poly(benzimidazobenzophenanthroline) (BBL) of orthogonal solvents. Generally, the fabrication of polymeric coaxial nanostructures tends to be troublesome. Using the electrospinning technique, P3HT was successfully used as the core, and the BBL as the shell, thus conceptually forming a p-n junction that is cylindrical in form with diameters in a range from 280 nm to 2.8 µm. The UV–VIS of P3HT/PS blend solution showed no evidence of separation or precipitation, while the combined solutions of P3HT/PS and BBL were heterogeneous. TEM images show a well-formed coaxial structure that is normally not expected due to rapid reaction and solidification when mixed in vials in response to orthogonal solubility. For this reason, extruding it by using electrostatic forces promoted a quick elongation of the polymers while forming a concise interface. Single nanofiber electrical characterization demonstrated the conductivity of the coaxial surface of ~1.4 × 10−4 S/m. Furthermore, electrospinning has proven to be a viable method for the fabrication of pure semiconducting coaxial nanofibers that can lead to the desired fabrication of fiber-based electronic devices.
4 February 2020 in IEEE Sensors Letters
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KPKavyashree Puttananjegowda
Kavyashree Puttananjegowda
ATArash Takshi
Arash Takshi
STSylvia Thomas
Sylvia Thomas
This paper presents a conductive polymer based electrospun-nanofibrous-membrane (ENFM) for enzymatic electrochemical glucose sensor. ENFM based sensor electrode shows a wide detection range from 0 mM to 25 mM concentration with a shorter response time of less than 4 sec and the sensitivity of $5.11 \mu\text{A}/ \text{mM}\; \text{cm}^2$ with limit of detection 2.2 μM in a glucose buffer solution. The sensing electrode shows negligible change in current response for upto 50 days. The sensing activity of electrode remained constant indicating a good long-term stability for the glucose sensor due to the direct immobilization of glucose oxidase (GOx) enzyme onto the surface of nanofibers. The electrochemical analysis results demonstrated that the ENFM based glucose sensor provides reliable results in terms of enhanced sensitivity, good stability, durability, and quick response time for glucose detection.
2 January 2020 in Journal of the Electrochemical Society
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KPKavyashree Puttananjegowda
Kavyashree Puttananjegowda
ATArash Taksi
Arash Taksi
STSylvia Thomas
Sylvia Thomas
Biosensing has capitalized on the excellent characteristics and properties of nanostructures for detecting glucose levels in diabetic patients. In glucose sensing systems, the fabrication of a suitable matrix for immobilizing glucose oxidase (GOx) has become more interesting for the application of nanofibers in enzymatic electrochemical biosensors. These nanofiber based electrochemical biosensors are superior in manufacturability and performance due to low cost, diversity of materials, ease of miniaturization, response time, durability, and structure versatility. This perspective highlights the latest material integration of various nanofibrous composite membranes of carbon nanotubes, carbon nanofibers, conductive nanoparticles and conductive polymers, that provide large matrix-like, porous surfaces to enhance the immobilization of enzymes, for the fabrication of glucose biosensors.
28 February 2020 in Analog Integrated Circuits and Signal Processing
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KPKavyashree Puttananjegowda
Kavyashree Puttananjegowda
STSylvia Thomas
Sylvia Thomas