Researcher:
Das, Ritu

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Researcher

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Ritu

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Das

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Das, Ritu

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    Publication
    Recent advances in transparent electrodes and their multimodal sensing applications
    (Wiley, 2024) Althumayri, Majed; Banavath, Ramu; Achim, Alin M.; Koydemir, Hatice Ceylan; Department of Mechanical Engineering; Department of Mechanical Engineering; Das, Ritu; Beker, Levent; Graduate School of Sciences and Engineering; College of Engineering
    This review examines the recent advancements in transparent electrodes and their crucial role in multimodal sensing technologies. Transparent electrodes, notable for their optical transparency and electrical conductivity, are revolutionizing sensors by enabling the simultaneous detection of diverse physical, chemical, and biological signals. Materials like graphene, carbon nanotubes, and conductive polymers, which offer a balance between optical transparency, electrical conductivity, and mechanical flexibility, are at the forefront of this development. These electrodes are integral in various applications, from healthcare to solar cell technologies, enhancing sensor performance in complex environments. The paper addresses challenges in applying these electrodes, such as the need for mechanical flexibility, high optoelectronic performance, and biocompatibility. It explores new materials and innovative techniques to overcome these hurdles, aiming to broaden the capabilities of multimodal sensing devices. The review provides a comparative analysis of different transparent electrode materials, discussing their applications and the ongoing development of novel electrode systems for multimodal sensing. This exploration offers insights into future advancements in transparent electrodes, highlighting their transformative potential in bioelectronics and multimodal sensing technologies. This review evaluates recent advancements in transparent electrodes, emphasizing their important role in multimodal sensing technologies. Highlighting materials such as graphene, carbon nanotubes, and conductive polymers, it explores their applications across various sectors, including healthcare and environmental monitoring. The paper discusses material properties, challenges, and innovative solutions, providing insights into future developments in bioelectronics and sensor technology.
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    Paper integrated microfluidic contact lens for colorimetric glucose detection
    (Royal Soc Chemistry, 2024) İstif, Emin; Department of Mechanical Engineering; Department of Mechanical Engineering; İşgör, Pelin Kübra; Abbasiasl, Taher; Das, Ritu; Yener, Umut Can; Beker, Levent; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); Graduate School of Sciences and Engineering; College of Engineering
    Contact lenses offer a simple, cost-effective, and non-invasive method for in situ real-time analysis of various biomarkers. Electro-chemical sensors are integrated into contact lenses for analysis of various biomarkers. However, they suffer from rigid electronic components and connections, leading to eye irritation and biomarker concentration deviation. Here, a flexible and microfluidic integrated paper-based contact lens for colorimetric analysis of glucose was implemented. Facilitating a three-dimensional (3D) printer for lens fabrication eliminates cumbersome cleanroom processes and provides a simple, batch compatible process. Due to the capillary force of the filter paper, the sample was routed to detection chambers inside microchannels, and it allowed further colorimetric detection. The paper-embedded microfluidic contact lens successfully detects glucose down to 2 mM within ∼10 s. The small dimension of the microfluidic system enables detection of glucose levels as low as 5 μl. The results show the potential of the presented approach to analyze glucose concentration in a rapid manner. It is demonstrated that the fabricated contact lens can successfully detect glucose levels of diabetic patients.