Sensing Using Piezoelectric Chiral Polymer Fiber

Ito, Syuhei; Imoto, Kenji; Takai, Kyohei; Kuroda, Shintaro; Kamimura, Yuki; Kataoka, Takuya; Kawai, Naoki; Date, Munehiro; Fukada, Eiichi

doi:10.1143/jjap.51.09ld16

Cited by 45 publications

(37 citation statements)

References 17 publications

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“…The sensor generated an electric charge by expansion and contraction. [23][24][25] The piezoelectric constant was d 14 ¼ 6 pCN À1 . The size of the glass was consistent with a 5-in.…”

Section: Simulationsmentioning

confidence: 99%

Pressure-Sensitive Touch Panel Based on Piezoelectric Poly(L-lactic acid) Film

Ando

Kawamura

Kitada

et al. 2013

Jpn. J. Appl. Phys.

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Poly(lactic acid) (PLA) is a widely used biomass-derived polymer. It is chiral because the lactic acid monomer has an asymmetric carbon. If the L-lactide is polymerized, then the PLA polymer is an L-type PLA or poly(L-lactic acid) (PLLA); if the D-lactide in PLA is polymerized, then the polymer is a D-type PLA (PDLA). When these polymers undergo drawing or elongation, they exhibit shear piezoelectricity. PLA films are highly transparent and do not exhibit pyroelectricity because of the lack of intrinsic polarization. Therefore, if a PLLA film is used for a touch panel, which is operated by pressure, there is no spurious signal due to heating from the fingers. This suggests that PLLA films may be suitable for touch panels using pressure detection. We used PLLA as the base film of a projected capacitive touch panel with multiple electrodes, and demonstrated a multitouch gesture screen that was sensitive to pressure applied on the screen. This touch panel technology has potential applications for smart phones and tablet personal computers. #

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“…The sensor generated an electric charge by expansion and contraction. [23][24][25] The piezoelectric constant was d 14 ¼ 6 pCN À1 . The size of the glass was consistent with a 5-in.…”

Section: Simulationsmentioning

confidence: 99%

Pressure-Sensitive Touch Panel Based on Piezoelectric Poly(L-lactic acid) Film

Ando

Kawamura

Kitada

et al. 2013

Jpn. J. Appl. Phys.

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“…Solid-solutions of group-III sesquioxides (Al 2 O 3 , Ga 2 O 3 , and In 2 O 3 ) show promise in designing new transparent n-type electrodes or active materials for optoelectronic applications because of the ability to tune the bandgap energies over large ranges (i.e., 3.6-7.5 eV) by varying the relative cation concentration [1][2][3][4][5][6][7]. Moreover, heterostructural solid solutions such as the group-III sesquioxides where the binary components differ in their ground-state structures, offer the possibility of controlling the crystal structure by tuning the composition.…”

Section: Introductionmentioning

confidence: 99%

Investigating the ranges of (meta)stable phase formation in (InxGa1−x)2O3
Wouters
¹
,
Sutton
²
,
Ghiringhelli
³

et al. 2020
Phys. Rev. Materials
18
0
8
1
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We investigate the phase diagram of the heterostructural solid solution (In x Ga 1-x ) 2 O 3 both computationally, by combining cluster expansion and density functional theory, and experimentally, by means of transmission electron microscopy (TEM) measurements of pulsed laser deposited (PLD) heteroepitaxial thin films. The shapes of the Gibbs free energy curves for the monoclinic, hexagonal, and cubic bixbyite alloy as a function of composition can be explained in terms of the preferred cation coordination environments of indium and gallium. We show by atomically resolved scanning TEM that the strong preference of indium for sixfold coordination results in ordered monoclinic and hexagonal lattices. This ordering impacts the configurational entropy in the solid solution and thereby the (In x Ga 1-x ) 2 O 3 phase diagram. The resulting phase diagram is characterized by very limited solubilities of gallium and indium in the monoclinic, hexagonal, and cubic ground state phases, respectively, but exhibits wide metastable ranges at realistic growth temperatures. On the indium rich side of the phase diagram a wide miscibility gap up to temperatures higher than 1400 K is found, which results in phase separated layers. The experimentally observed indium solubilities in the PLD samples are in the range of x = 0.45 and x = 0.55 for monoclinic and hexagonal single-phase films, while for phase separated films we find x = 0.5 for the monoclinic phase, x = 0.65-0.7 for the hexagonal phase and x 0.9 for the cubic phase. These values are consistent with the computed metastable ranges for each phase.

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“…[1][2][3] Based on its piezoelectric characteristics, PLA has also been studied for application in pressure-sensitive displays. 4,5 Although the piezoelectric constant of PLLA is lower than that of piezoelectric ceramics due to the nonuniform structure in the PLLA film (high-order structure), it is possible to improve the piezoelectricity of PLLA films by adding inorganic nanoparticles. 6,7 PDLA/PLLA multilayer films can also be engineered to exhibit strong piezoelectric resonance and a piezoelectric performance equivalent to those of piezoelectric ceramics.…”

Section: Introductionmentioning

confidence: 99%