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Fabrication of a Self-Powered Photodetector Based on Triboelectric Nanogenerator for Health Parameters Monitoring

Mirsepah, Ali | 2025

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 58472 (48)
  4. University: Sharif University of Technology
  5. Department: Institute for Nanoscience and Nanotechnology
  6. Advisor(s): Mohammadpour, Raheleh; Esfandiar, Ali; Iraji Zad, Azam
  7. Abstract:
  8. Nowadays, the use of wearable and portable electronics for continuous monitoring of health parameters and environmental factors seems highly desirable and essential. Utilizing ambient energy as the power source for these electronic devices, as a replacement for batteries, is crucial due to the negative aspects associated with battery use, such as the need for periodic replacement and their often limited availability. This study aims to contribute to the development of portable, sustainable, and efficient devices for monitoring health parameters and environmental sensing. In this study, a self-powered wearable MoS2-based photodetector, integrated with a PDMS-MXene-based triboelectric nanogenerator (TENG) is presented. The TENG generates isometric AC voltage using a 14V diode, and it is used to charge a 220µF capacitor for DC voltage output. The photodetector, with a responsivity of 1.25×105A/W, specific detectivity of 2×1013 Jones and 4.2 ms response time while connected to DC voltage and enhanced responsivity of 1.1×1010 V/W and specific detectivity of 9.5×1016 Jones while coupled with TENG, successfully measured heart rate using a 660 nm LED light reflected from human tissue and compared well with a commercial pulse meter. Additionally, UV light, which is significant for detecting water and air pollutants and preventing skin damage due to solar radiation, was measured using a 395 nm LED under varying irradiation intensities with the AC voltage of the TENG. The photoresponsivity and specific detectivity under 395 nm LED irradiation were measured as 4.7 × 10⁷ V/W and 1.5 × 10¹⁴ Jones, respectively. The outcomes of this study, exemplified by the development of an 80-gram lightweight wristband capable of detecting heart rate and UV light, represent a significant advancement in the field of lightweight wearable sensors and provide a viable alternative to battery-powered systems
  9. Keywords:
  10. Photodetector ; Triboelectric Nanogenerator ; Self-Powered Sensor ; Heart Rate Variability ; Portable Devices ; Health Monitoring

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