Advertisement

Topics

Electron Transfer in Nanoscale Contact Electrification: Photon Excitation Effect.

08:00 EDT 16th May 2019 | BioPortfolio

Summary of "Electron Transfer in Nanoscale Contact Electrification: Photon Excitation Effect."

Contact electrification (CE) (or triboelectrification) is a well-known phenomenon, and the identity of the charge carriers and their transfer mechanism have been discussed for decades. Recently, the species of transferred charges in the CE between a metal and a ceramic was revealed as electron transfer and its subsequent release is dominated by the thermionic emission process. Here, the release of CE-induced electrostatic charges on a dielectric surface under photon excitation is studied by varying the light intensity and wavelength, but under no significant raise in temperature. The results suggest that there exists a threshold photon energy for releasing the triboelectric charges from the surface, which is 4.1 eV (light wavelength at 300 nm) for SiO and 3.4 eV (light wavelength at 360 nm) for PVC; photons with energy smaller than this cannot effectively excite the surface electrostatic charges. This process is attributed to the photoelectron emission of the charges trapped in the surface states of the dielectric material. Further, a photoelectron emission model is proposed to describe light-induced charge decay on a dielectric surface. The findings provide an additional strong evidence about the electron transfer process in the CE between metals and dielectrics as well as polymers.

Affiliation

Journal Details

This article was published in the following journal.

Name: Advanced materials (Deerfield Beach, Fla.)
ISSN: 1521-4095
Pages: e1901418

Links

DeepDyve research library

PubMed Articles [19545 Associated PubMed Articles listed on BioPortfolio]

Hydrated Electron Generation by Excitation of Copper Localized Surface Plasmon Resonance.

Hydrated electrons are important in radiation chemistry and charge-transfer reactions with applications that include chemical damage of DNA, catalysis and signalling. Conventionally, hydrated electron...

Contact-Electrification Between Two Identical Materials: Curvature Effect.

It is known that contact-electrification (or triboelectrification) usually occurs between two different materials, which could be explained by several models for different materials systems (Adv. Mate...

Multi-Photon Excitation of CsPbBr Perovskite Quantum Dots: How Many Electrons Can One PQD Donate to Multiple Molecular Acceptors?

Metastable multi-excitonic states (MES) of semiconductor quantum dots can be involved in multi-electron transfer reaction, which opens new perspectives in nanomaterials-based opto-electronic applicati...

Harnessing photoinduced electron transfer to optically determine protein sub-nanoscale atomic distances.

Proteins possess a complex and dynamic structure, which is influenced by external signals and may change as they perform their biological functions. We present an optical approach, distance-encoding p...

On the Mechanism of Phenolate Photo-Oxidation in Aqueous Solution.

The photo-oxidation dynamics following UV (257 nm) excitation of the phenolate anion in aqueous solution is studied using broadband (550 to 950 nm) transient absorption spectroscopy. A clear signature...

Clinical Trials [3666 Associated Clinical Trials listed on BioPortfolio]

Pilot Study to Assess the Quantitative Dermal Transfer Efficiencies of Solids for Multiple Transfer Pathways

Dermal transfer efficiency has been defined as the amount of material that moves from one surface to another following contact. The investigators propose to measure dermal transfer effici...

Preparing and Timing of the Endometrium in Modified Natural Cycle Frozen-thawed Embryo Transfers

The increasing use of FET emphasizes the importance of preparing and timing the endometrium in FET cycles, however there is no consensus on luteal phase progesterone supplementation in mNC...

The Effect of Ophthalmic Solutions on Contact Lenses Used After Surgery for Congenital Cataract Investigated in Vivo

Patients with congenital cataract operated at St. Erik Eye Hospital are given the topical steroid dexamethasone (Isopto-Maxidex) according to a set treatment plan. They are provided a cont...

Study of Low-Dose Total Skin Electron Beam Therapy in Mycosis Fungoides

The purpise of this study was to determine the effect of low-dose (4 Gy) total skin electron beam therapy as a second-line treatment of stage IB-II mycosis fungoides.

Fractionated Radiation Therapy in Treating Advanced Squamous Cell Carcinoma of the Head and Neck

RATIONALE: Patient abstract not available PURPOSE: Patient abstract not available

Medical and Biotech [MESH] Definitions

An autosomal recessive disorder of fatty acid oxidation, and branched chain amino acids (AMINO ACIDS, BRANCHED-CHAIN); LYSINE; and CHOLINE catabolism, that is due to defects in either subunit of ELECTRON TRANSFER FLAVOPROTEIN or its dehydrogenase, electron transfer flavoprotein-ubiquinone oxidoreductase (EC 1.5.5.1).

An electron transport chain complex that catalyzes the transfer of electrons from SUCCINATE to CYTOCHROME C. It includes ELECTRON TRANSPORT COMPLEX II and ELECTRON TRANSPORT COMPLEX III.

A method of computed tomography that uses radionuclides which emit a single photon of a given energy. The camera is rotated 180 or 360 degrees around the patient to capture images at multiple positions along the arc. The computer is then used to reconstruct the transaxial, sagittal, and coronal images from the 3-dimensional distribution of radionuclides in the organ. The advantages of SPECT are that it can be used to observe biochemical and physiological processes as well as size and volume of the organ. The disadvantage is that, unlike positron-emission tomography where the positron-electron annihilation results in the emission of 2 photons at 180 degrees from each other, SPECT requires physical collimation to line up the photons, which results in the loss of many available photons and hence degrades the image.

Flavoproteins that serve as specific electron acceptors for a variety of DEHYDROGENASES. They participate in the transfer of electrons to a variety of redox acceptors that occur in the respiratory chain.

Cytochromes of the c type that are found in eukaryotic MITOCHONDRIA. They serve as redox intermediates that accept electrons from MITOCHONDRIAL ELECTRON TRANSPORT COMPLEX III and transfer them to MITOCHONDRIAL ELECTRON TRANSPORT COMPLEX IV.

Advertisement
Quick Search
Advertisement
Advertisement

 


DeepDyve research library

Searches Linking to this Article