2, Pusan National University, Miryang, , Korea (the Republic of)
For harvesting eco-environment energy, triboelectric nanogenerator (TENG) was fabricated which can generate electric energy from ambient mechanical energy. Although the TENG consists of cheap and affordable materials, the ingredients of TENG would be still difficult to obtain for the Third World people. Therefore, silica-based powder TENG (S-TENG) was demonstrated, which utilizes sand as a freestanding dielectric layer for triboelectrification. Sand is mainly consisted of silicon and oxygen which are constituting the earth’s crust. Sand has advantage of easy availability on earth. To demonstrate general electrical output, silicon and silicon dioxide are utilized with the sand for fabricating TENG. PTFE film which tends to be negatively charged was utilized as a counter triboelectric contact material. The highest electrical output was generated when using silicon dioxide as a dielectric layer. Because silicon dioxide tends to be positively charged than sand and silicon do. The result showed an open-circuit voltage as high as 15 V and a short-circuit current of 350 nA when using silicon dioxide and shaken by electrodynamic shaker. In case of hand shaking, the power density shows the peak value of 0.3 mW/m2. Besides, five commercial LEDs are simultaneously turned on when using half fist sized S-TENG device. The electrical energy which is sufficient for the people in the Third World can be generated by several number of this S-TENG device.