In situ ZnO nanowire growth to promote the PVDF piezo phase and the ZnO–PVDF hybrid self-rectified nanogenerator as a touch sensor

Abstract

A PVDF-ZnO nanowires (NWs) hybrid generator (PZHG) was designed. A simple, cost effective method to produce the PVDF β phase by nano force is introduced. With the ZnO NWs growing, the in situ nano extension force promotes the phase change. A theoretical analysis of the ZnO NWs acting as a self-rectifier of the nano generator is established. The ZnO NWs acted as a self-adjustment diode to control the current output of the PZHG by piezo-electric and semi-conductive effects. Based on the self-controllability of the piezoelectric output, three kinds of finger touching are distinguished by the output performances of the PZHG, which is applicable to an LCD touch pad.

A rectification-free piezo-supercapacitor with a polyvinylidene fluoride separator and functionalized carbon cloth electrodes

“…Energy harvesting device can convert the energy in other forms into the electricity but has limited energy storage. Usually, energy harvesting and storage devices are connected together by a power management circuit to enable sustainable power supply [12][13][14][15][16][17][18][19][20][21] . Piezoelectric materials can convert ubiquitously irregular and low-frequency mechanical vibration into electricity and have been extensively studied for the use of nanogenerator [22][23][24][25][26][27][28][29][30] .…”

Enhanced piezo‐electric property induced in graphene oxide/polyvinylidene fluoride composite flexible thin films

“…XRD pasttern of PVDF indicated peaks at 2 θ = 18.6° and 2 θ = 21.5° arising out of reflections from (020) and (110) planes arising from α‐ and the β‐phase of PVDF, respectively . There are two other peaks at 2 θ = 26.6° arising out of reflections from (021) plane of the PVDF α phase and 2 θ = 39.5° arising out due to the PVDF α phase . The broad peak located at ∼22° composed of two peaks β phase PVDF (21.6°) and a shoulder peak of PVDF with less intensity (JCPDS card no.38–1638).…”

Environmental Effects on the Polypyrrole Tri-layer Actuator

“…This is because when the applied potential is too positive, As shown in Figure 3a, X-ray diffraction studies show that the PPy film is crystalline in nature, with a sharp diffraction peak observed at about 2θ = 23 • . The sharp peak is characteristic of crystalline PPy [38], and is due to the scattering from PPy chains at the interplanar spacing [39,40]. Figure 3c illustrates the Raman spectrum of PPy/Au/PVDF, the characteristic bands of which appear at 1587 and 1365 cm −1 , which were assigned to the C-C backbone stretching and the ring stretching vibration of PPy, respectively [41].…”