On the surface trapping parameters of polytetrafluoroethylene block

Zhang, Guanjun; Yang, Kai; Zhao, Wen-Bin; Zhang, Yan

doi:10.1016/j.apsusc.2006.03.082

Cited by 14 publications

(8 citation statements)

References 8 publications

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“…[43] According to the IR absorption spectra of PTFE, we could know that the dangling bonds on the PTFE surface will react with the oxygen-containing electron acceptors in the air to form various oxygen-containing groups. [43] According to the IR absorption spectra of PTFE, we could know that the dangling bonds on the PTFE surface will react with the oxygen-containing electron acceptors in the air to form various oxygen-containing groups.…”

Section: The Characterization Of Ptfe Sheetsmentioning

confidence: 99%

Temperature Effect on Performance of Triboelectric Nanogenerator

Han

et al. 2017

Adv Eng Mater

186

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The triboelectric nanogenerator (TENG) is a promising energy harvesting technology that can convert mechanical energy into electricity and can be used as self-powered active sensors. However, previous studies are mostly carried out at room temperature without considering the temperature effect on the electrical performance of TENGs, which is critical for the application of electronics powered by TENGs in different regions in the world. In the present work, a TENG that worked in the single-electrode and contactseparation mode is utilized to reveal the influence of environment temperature on the electrical performance of TENG. The electrical performance of the TENG shows a decreasing tendency, as the temperature rises from À20 to 150 C, which is controlled by the temperature-induced changes in the ability of storing and gaining electrons for polytetrafluoroethylene (PTFE). The storing electron ability change of PTFE is attributed to two aspects: one is the reduction of relative permittivity of PTFE sheet as the temperature increases, and the other is the variations of effective defects such as the escape of trapped charges in shallow traps and surface oxidation under the effect of temperature perturbation. This work can provide useful information for the application of TENG in both electric power generation and selfpowered sensors in the harsh environment. Experimental SectionFabrication of the TENG: The TENG in this work was made up of a Al foil (55 Â 55 Â 1 mm), polyethylene terephthalate (PET) insulation tapes, PTFE sheets (55 Â 55 Â 3 mm). The PTFE sheet is a commercial product

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Section: The Characterization Of Ptfe Sheetsmentioning

confidence: 99%

Temperature Effect on Performance of Triboelectric Nanogenerator

Han

et al. 2017

Adv Eng Mater

186

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“…The VUV photons produced in this process can liberate PTFE electron-hole pairs. As the holes in PTFE have a significantly higher mobility than the electrons [20,21], the applied electric field preferentially removes holes, resulting in a buildup of net negative charge over long time scales. The observed charge densities and transport time scales are consistent with values in the literature [22,23].…”

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confidence: 99%

Dark Matter Still at Large

Cooley

2017

Physics

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We report constraints on spin-independent weakly interacting massive particle (WIMP)-nucleon scattering using a 3.35 × 10 4 kg day exposure of the Large Underground Xenon (LUX) experiment. A dual-phase xenon time projection chamber with 250 kg of active mass is operated at the Sanford Underground Research Facility under Lead, South Dakota (USA). With roughly fourfold improvement in sensitivity for high WIMP masses relative to our previous results, this search yields no evidence of WIMP nuclear recoils. At a WIMP mass of 50 GeV c −2 , WIMP-nucleon spin-independent cross sections above 2.2 × 10 −46 cm 2 are excluded at the 90% confidence level. When combined with the previously reported LUX exposure, this exclusion strengthens to 1.1 × 10 −46 cm 2 at 50 GeV c −2 .

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“…One study found that after charging the PTFE block for 30 mins by applying a voltage of ±5 kV at room temperature, the half-life period of surface potential decay was 5 min for hole traps and 150 min for electron traps, reflecting this distinct difference in the surface layer of PTFE as shown Figure 3.11. The energy levels of electron traps and hole traps were about 0.85 − 1.0 eV and 0.80 − 0.90 eV, respectively [276]. A timescale of hole transport in the LUX PTFE surface as seen in the high purity, low-temperature LXe environment is shown in Figure 3.…”

Section: Charges In Ptfementioning

confidence: 97%

“…To mitigate the amount of positive/negative charges in PTFE, the material can be heated up while either blasting an electron gun or shining a VUV light until an equilibrium is reached. Heating the material helps the charge mitigation since both the charge lifetime τ and conductivity G are temperature dependent [276,271]:…”

Section: Charges In Ptfementioning

confidence: 99%

Sub-GeV Dark Matter Searches and Electric Field Studies for the LUX and LZ Experiments

Tvrznikova¹

2019

Preprint

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To that end, the Large Underground Xenon (LUX) experiment was built to directly observe the interaction of DM with xenon target nuclei. LUX acquired data from April 2013 to May 2016 at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, which led to publications of many world-leading exclusion limits that probe much of the unexplored DM parameter space. This manuscript describes two novel direct detection methods that used the first LUX dataset to place limits on sub-GeV DM. The Bremsstrahlung and Migdal effects consider electron recoils that accompany the standard DM-nucleus scattering, thereby extending the reach of the LUX detector to lower DM masses. The spin-independent DM-nucleon scattering was constrained for four different classes of mediators for DM particles with masses of 0.4-5 GeV/c 2 .The detector conditions changed significantly before its final 332 live-days of data acquisition. The electric fields varied in a non-trivial non-symmetric manner, which triggered a need for a fully 3D model of the electric fields inside the LUX detector. The successful modeling of these electric fields, described herein, enabled a thorough understanding of the detector throughout its scientific program and strengthened its sensitivity to DM.The LUX-ZEPLIN (LZ) experiment, the successor to LUX, is a next-generation xenon detector soon to start searching for DM. However, increasingly large noble liquid detectors like LZ are facing challenges with applications of high voltage (HV). The Xenon Breakdown Apparatus (XeBrA) at the Lawrence Berkeley National Laboratory was built to characterize

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On the surface trapping parameters of polytetrafluoroethylene block

Cited by 14 publications

References 8 publications

Temperature Effect on Performance of Triboelectric Nanogenerator

Temperature Effect on Performance of Triboelectric Nanogenerator

Dark Matter Still at Large

Sub-GeV Dark Matter Searches and Electric Field Studies for the LUX and LZ Experiments

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