Photocathodes

Diamond is an extremely interesting material for photoemission applications, due to its low electron affinity (EA). The EA of a surface is the barrier that hinders the electrons in the conduction band from escaping into vacuum. If diamond surface is hydrogenated, the EA becomes negative by shifting the vacuum level beneath the minimum of conduction band.

photocathodes1

Photocathodes based on MWPECVD polycrystalline diamond films

FIGa_b (1)

Photocathodes based on sprayed nanodiamond (ND) particle layers

Neutralizer Cathode

Neutralizer cathodes for ion sources in aerospace propulsions are proposed and tested for the good photo- and thermionic electron emission properties of NCD films grown on p-Si substrate.

The emissive properties of NCD are mainly influenced by the deposition temperature that affects the hydrogen incorporation, the grain shape and size.

The fraction volume of the grain boundaries varies the incorporated hydrogen and causes a modulation of the surface electron affinity. The NCD films with a buffer layer (BL) grown at the highest deposition temperature have shown the highest photo- and thermionic emission currents.

Collaborations

Dipartimento di Fisica Università degli Studi di Bari

Laboratoire des Sciences des Procédés et des Matériaux CNRS Université Paris

CNR-ISM UOS Montelibretti Roma.

Facilities & Labs

People

Foto_GraziaCicala2Grazia

Cicala

Valentini

Velardi

Publications

  1. A. Nitti, E. Nappi, A. Valentini, F. Bénédic, P. Bruno and G. Cicala, “Progress in the production of CsI and diamond thin film photocathodes.” Nuclear Instruments and Methods in Physics Research A 553 157-164 (2005).
  2. A. Nitti, M. Colasuonno, E. Nappi, A. Valentini, F. Bénédic, G. Cicala, E. Milani, G. Prestopino “Performance analysis of poly- and nano-crystalline diamond based photocathodes” Nuclear Instruments and Methods in Physics Research A595 131-135 (2008).
  3. Cicala, M. A. Nitti, A. Tinti, A. Valentini, A. Romeo, R. Brescia, P. Spinelli, M. Capitelli, “Effect of Properties of MWPECVD Polycrystalline Diamond Films on Photoemissive Response”, Diamond and Related Materials, 20 1199-1203 (2011).
  4. Velardi, A. Valentini, G. Cicala, “Highly efficient and stable ultraviolet photocathode based on nanodiamond particles”, Appl. Phys. Lett. 108
  5. Cicala, V. Magaletti, A. Valentini, M.A. Nitti, A. Bellucci, D.M. Trucchi “Photo- and thermionic emission of MWPECVD nanocrystalline diamond films”, Applied Surface Science 320 798–803 (2014).

Patents

Fotocatodi ad alta efficienza per ultravioletto a base di nanodiamante.
Inventor: Antonio Valentini, Domenico Melisi, Giuseppe De Pascali (Sezione INFN di Bari), Grazia Cicala’, Luciano Velardi, Alessandro Massaro (CNR)
Registered in: Italia
Priority Details: 21/09/2015, domanda di brevetto N. 102015000053374
Also published as:
Applicant: INFN, CNR

Project

Progetto Strategico ATS PS_136 of Regione Puglia, Italy;

Progetto PON03PE_00067_6 “APULIA SPACE”, Italy.

Progetto Partenariati Regionali per l’Innovazione” of Regione Puglia (Italy);

Latest News

WELFARE E PARI OPPORTUNITA'

[vc_row][vc_column][vc_column_text]

September 14-22, 2019

 

Science coffee. Tre scienziate si raccontano: Luisa Torsi, Loretta L del Mercato, Eva Degl'Innocenti Bari - Fiera del Levante, 20 settembre 2019 - 17.30

Luisa Torsi, chimica, docente all’Università degli Studi di Bari e alla ABO Akademi University in Finlandia, tra le protagoniste della mostra della Fondazione Bracco . Loretta L del Mercato, biotecnologa - Ricercatrice CNR Nanotec. Esperta nell’uso delle nanotecnologie applicate in campo biomedico. Attualmente la ricerca si concentra sullo sviluppo di modelli cellulari di tumore del pancreas che consentano di testare l'efficacia di diverse terapie anticancro. Coordina il progetto ERC-StG “INTERCELLMED” finanziato dal Consiglio europeo della ricerca (Erc). Eva Degl'Innocenti, Direttrice MARTA di Taranto [/vc_column_text][/vc_column][/vc_row]

ICONS - A Symposium on Colloidal Nanocrystals

[vc_row][vc_column][vc_column_text]

October 10-11, 2019

 

Cnr Nanotec Lecce

 

The symposium focuses on colloidal semiconductor nanocrystals (also known as quantum dots), which are a central topic in materials science and nanotechnology nowadays. The event will bring together renowned scientists in this research field discussing on fundamentals and future directions of this promising class of materials.  The program consists of two half-day sessions with four talks each covering synthesis, characterization, properties, and applications of colloidal semiconductor nanocrystals. The detailed program will be soon available.

The symposium is intended for anyone that is interested on this topic and will be free of charge. Attendees may present their own work in the dedicated poster session. Registration, with an eventual abstract submission for poster presentation, is required (please, send an e-mail to:   carlo.giansante@nanotec.cnr.it). The event is co-organized by Consiglio Nazionale delle Ricerche - Istituto di Nanotecnologia and Istituto Italiano di Tecnologia.

The final program is now available for download: ICoNS_Program[/vc_column_text][/vc_column][/vc_row]

DIAGNOSTICS OF BRAIN DISEASES VIA STEM CELLS

 01 luglio 2019 - ore 14:15

 

Cnr Nanotec Lecce

 

Realizzato nell'ambito delle attività del progetto "TecnoMed Puglia - Tecnopolo per la medicina di precisione", il meeting è dedicato allo studio delle malattie neurodegenerative: dai nuovi biomarcatori alle piu recenti modellizzazioni, per una migliore comprensione dei meccanismi di base e quindi per lo sviluppo di terapie sempre più ritagliate sul singolo paziente.

Job Openings

No posts found.