Comparison between photoemitting and colloidal properties of nanodiamond particles
| Autor: | Giuseppe Perna, Vittorio Capozzi, L. Velardi, Gerardo Palazzo, Antonio Valentini, G. Cicala |
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| Rok vydání: | 2017 |
| Předmět: |
Hydrogen treatment
Materials science Aqueous dispersion Analytical chemistry Nanotechnology 02 engineering and technology Photocathode engineering.material 010402 general chemistry 01 natural sciences Quantum efficiency Colloid and Surface Chemistry Phase (matter) Zeta potential Graphite Nanodiamond Diamond Nanodiamond particle 021001 nanoscience & nanotechnology 0104 chemical sciences engineering Surface modification Particle 0210 nano-technology |
| Zdroj: | Colloids and surfaces. A, Physicochemical and engineering aspects 532 (2017): 493–500. doi:10.1016/j.colsurfa.2017.04.018 info:cnr-pdr/source/autori:Cicala, G.; Velardi, L.; Palazzo, G.; Valentini, A.; Perna, G.; Capozzi, V./titolo:Comparison between photoemitting and colloidal properties of nanodiamond particles/doi:10.1016%2Fj.colsurfa.2017.04.018/rivista:Colloids and surfaces. A, Physicochemical and engineering aspects (Print)/anno:2017/pagina_da:493/pagina_a:500/intervallo_pagine:493–500/volume:532 |
| ISSN: | 0927-7757 |
| DOI: | 10.1016/j.colsurfa.2017.04.018 |
| Popis: | In this paper, we present an investigation on two types of nanodiamond (ND) powders with average size of particles around 250 nm and having different sp2 (graphite phase) and sp3 (diamond phase) carbon contents. The ND surface modification is carried out by physical methods i.e. treatments in H2 microwave plasma. The quantum efficiency (QE) of photocathodes and the stability of aqueous dispersions are assessed by photoemission and zeta potential (ZP) measurements, respectively. The resultant hydrogenated surface affects in the solid state the QE of ND-based photocathodes and in solution the particle ZP. The effect of the hydrogen treatment is beneficial inducing an enhancement of photocathode QE and a corresponding increase of the ZP. A schematized energy diagram is proposed to illustrate and explain the strong correlation between QE and ZP parameters. |
| Databáze: | OpenAIRE |
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