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Fabrication of a Tactile Sensor Based on Triboelectric Nanogenerators

Zamanpour, Fahimeh | 2023

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 56650 (48)
  4. University: Sharif University of Technology
  5. Department: Institute for Nanoscience and Nanotechnology
  6. Advisor(s): Mohammadpour, Raheleh; Sasanpour, Pezhman
  7. Abstract:
  8. Humans need the five senses to understand and interact constructively with their surrounding environment; in the world of robots and intelligent systems, this is achieved using sensors. In the modern world, tactile sensors based on triboelectric effect play a prominent role in important application areas such as health monitoring, human-computer interaction, robotics, pressure mapping, and electronic signature. Triboelectric nanogenerators (TENGs) are one type of energy harvesting systems that convert mechanical energy into electrical energy. In these sensors, due to the contact and touch with the triboelectric material, an electric charge is generated and induced into the electrode, then the current and voltage are produced and measured. Triboelectric nanogenerators consist of four main parts: the charge generation layer, the charge trapping layer, the charge collection layer, and the charge storage layer. The aim of this thesis is to design and produce tactile sensors based on triboelectric nanogenerators. For this purpose, the charge generating layer is composited with high dielectric constant and colorful powders, and with the electrode have been used in the applications such as on/off switch, smart toy, health monitoring device and multipurpose hybrid structure. To design and fabricate a flexible, transparent, and ultra-light weight touch on-off switch, a composite of silicone rubber and barium titanate (BaTiO3) was used as the charge generating layer and a transparent electrode made of silver nanowires (AgNWs). The produced nanogenerator had a transparency of 79%, a power density of 2.45 W⁄m2 and a mass of 8 mg⁄cm2. To fabricate attractive and distinctive colorful nanogenerators for the purpose of producing toys and wearable electronic devices, Silicone rubber was composited with colored chemical powders. All the fabricated layers were flexible, elastic and had high power density (4.5-6.5 W/m2). Based on this, a xylophone was designed that, after touching each button, a musical note is played and the pressure map is displayed on the computer screen at the same time. Composite with colored powders increased the toughness and fracture strain and decreases the elastic modulus, and due to the improvement of tensile properties, the best composite (green color) was used to recognize body movements with the machine learning (ML) method. finally, the epoxy resin/zinc oxide composite with an electrode made of silver nanowires was used in a transparent (70%) and sandwich-like structure to create a hybrid structure with a solar cell to harvest solar and mechanical energy. This device can recognize written English letters/ numbers, and people handwritings with the machine learning method. The triboelectric nanogenerators invented in this thesis with high power density along with unique features such as transparency, flexibility and being colorful have the potential to be used in fields such as human-computer interaction, robotics, pressure mapping, health monitoring and on/off touch switches
  9. Keywords:
  10. Flexibility ; Transparency ; Triboelectric Nanogenerator ; Silicone Rubbers ; Tactile Sensing ; Environmental Energy Harvesting ; Tactile Sensor

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