Title :
Enhancement in the field emission behavior of graphene in N2/O2 high vacuum ambience
Author :
Suryawanshi, S.R. ; Kolhe, P.S. ; Gavhane, D.S. ; Patil, S.S. ; Chavan, P.G. ; More, M.A. ; Late, Dattatray J.
Author_Institution :
Dept. of Phys., Univ. of Pune, Pune, India
Abstract :
Herein we report, pressure dependent field emission (FE) behaviour of a few-layer graphene emitter. Gas dependent FE properties have been investigated in ultra high vacuum (UHV), as well as in N2 and O2 ambience at base pressure ~ 1×10-6 torr. Interestingly, the graphene emitter when operated in N2/O2 ambience exhibits lower turn-on field and higher emission current density, as compared to the UHV conditions. The emission current stability investigated at preset value of ~1μA over the period of more than 2 hrs is found better in the N2 ambience and is characterized by fewer fluctuations, in contrast to the behaviour in the O2 ambience. The observed enhanced electron emission behavior in N2/O2 ambience is attributed to modulation of the work function of graphene emitter.
Keywords :
current density; field emission; fluctuations; graphene; C; N2-O2 high vacuum ambience; emission current stability; few-layer graphene emitter; fluctuations; gas-dependent field emission properties; higher emission current density; lower turn-on field; pressure-dependent field emission enhancement behavior; ultrahigh vacuum; work function; Current density; Graphene; Iron; Modulation; Physics; Thermal stability; Vacuum technology; Graphene; Pressure Dependent Field Emission;
Conference_Titel :
Vacuum Nanoelectronics Conference (IVNC), 2014 27th International
Conference_Location :
Engelberg
Print_ISBN :
978-1-4799-5306-6
DOI :
10.1109/IVNC.2014.6894791
