Abstract

Generally materials, having a low/negative electron affinity (NEA) and/or a low work function which facilitate the electron escape from their surfaces, exhibit good photo- and thermo-emission properties. From this point of view, natural and synthetic diamond is an interesting material because possesses a low EA that becomes negative when the surface is treated in H2 plasma. Moreover, as-grown diamond films produced by microwave plasma enhanced chemical vapour deposition and starting from CH4:H2 (1:99%) gas mixture exhibit hydrogenated surfaces, suitable for photocathodes, neutralizer cathode, energy converters and so on. Very recently the authors of this contribution have patented a new methodology (easy, inexpensive and working at temperature of 120°C) to fabricate layers of nanodiamond (ND) particles. In the present work, the photoemission behaviour of ND layers produced by this new methodology i.e. the pulsed spray technique is presented. Commercial (Diamonds & Tools srl) ND particles, 250 nm in size, were utilized. Layers of untreated and treated (in pure H2 or N2 plasmas) NDs were produced. The photoemission quantum efficiency (QE), a merit figure for photocathode applications, was assessed in the UV range (140-210 nm), showing a QE enhancement for both hydrogenated and nitrogenated ND particles.

Autore Pugliese

• Cicala Grazia

Tutti gli autori

• L. Velardi; A. Valentini; G. Cicala

Titolo volume/Rivista

Non Disponibile

Anno di pubblicazione

2016

ISSN

Non Disponibile

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

Non Disponibile

Ultimo Aggiornamento Citazioni

Non Disponibile

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile