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작성일 : 18-07-30 14:43
Harvester breath sensor_Applied Energy(IF:7.9)
 글쓴이 : supervisor
조회 : 300  
   20181015_Nirmal_breath_sensor_AppliedEnergy.pdf (3.2M) [5] DATE : 2018-07-30 14:43:02
Sustainable yarn type-piezoelectric energy harvester as an eco-friendly, costeffective battery-free breath sensor

  Nirmal Prashanth Maria Joseph Raj, Nagamalleswara Rao Alluri, Venkateswaran Vivekananthan,
Arunkumar Chandrasekhar, Gaurav Khandelwal, Sang-Jae Kim⁎
Nanomaterials & System Lab, Department of Mechatronics Engineering, Jeju National University, Jeju 690-756, South Korea

A cost-effective layer-by-layer brush-coating technique was developed to fabricate a flexible yarn-based piezoelectric
nanogenerator (FY-PNG) to harness abundant waste mechanical energy. A simple sol-gel method was used to synthesize
the orthorhombic crystalline phase of bismuth titanate perovskite, i.e., Bi4Ti3O12 (BiTO). A single FY-PNG
device generated a maximum peak-to-peak open-circuit voltage (VOC(P–P)), short-circuit current (ISC(P–P)), and instantaneous
area power density of 60V, 400nA, and 18.5mW/m2, respectively, upon application of a 1N periodic
mechanical load. The switching polarity of the FY-PNG demonstrated good phase shifting between the output signals
and confirmed that the output derived from the device and not from any external sources. The working mechanism,
electrical poling effect, force analysis, repeatability, stability, charging, energy storage analysis, and sensitivity to
biomechanical force of the FY-PNG was thoroughly investigated. The FY-PNG device output was used to power five
commercial green light-emitting diodes (LEDs) and a display system. Additionally, a non-invasive self-powered
breathing sensor (SPBS) was developed to monitor human inhalation/exhalation. The repeatability and reproducibility
of SPBS evaluated using different devices and test subjects demonstrated a good variation in output (i.e.,
0.2–0.4 V) for inhalation/exhalation; the SPBS was also evaluated under slow/fast and constant breathing conditions.
The proposed brush-coating technique for FY-PNGs is an efficient, cost-effective, eco-friendly, and easily scalable
technique that can pave the way to the design of novel-shaped PNG devices for applications such as implantable selfpowered
biosensors and automotive electronic systems.