Graphitic clusters in hydrogenated amorphous carbon induced by keV-ion irradiation

Journal Article · Mon Dec 10 04:00:00 EST 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.103832· OSTI ID:6224194

Compagnini, G; Foti, G; Reitano, R ^[1]; Mondio, G ^[2]

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1. Dipartimento di Fisica, Universita di Catania, Corso Italia 57, 95129 Catania (Italy)
2. Istituto Struttura della Materia, Universita di Messina, Salita Sperone 31, 98166 Sant'Agata, Messina (Italy)

Energy gap and hydrogen concentration have been measured in hydrogenated amorphous carbon ({ital a}-C:H) after bombardment with 100 keV He{sup +} and 300 keV Ar{sup +} ion beams, up to ion fluences 3{times}10{sup 16} ions/cm{sup 2}. {ital a}-C:H films have been obtained by ion irradiation at low ion fluences of polystyrene layers and with a subsequent low-temperature annealing (400 {degree}C, 10 min). Experimental values for the energy gap (2.5--0.5 eV) and hydrogen concentration (7.4{times}10{sup 22}--1.8{times}10{sup 22} H atoms/cm{sup 3}) have been interpreted in terms of a graphitic cluster structure with a different size (3--20 A). We were able to determine experimentally the value of the bond integral {vert bar}{beta}{vert bar} and we found it in good agreement with the calculated one for graphite.

• OSTI ID: 6224194
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 57:24; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360605* -- Materials-- Radiation Effects
ARGON IONS
CARBON
CHARGED PARTICLES
CHEMICAL REACTIONS
DEPOSITION
ELEMENTS
ENERGY GAP
FILMS
HYDROGENATION
IONS
MATERIALS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL RADIATION EFFECTS
PLASTICS
POLYMERS
POLYOLEFINS
POLYSTYRENE
POLYVINYLS
RADIATION EFFECTS
SYNTHETIC MATERIALS
THIN FILMS