Passacantando M, Bussolotti F, Santucci S, Di Bartolomeo A, Giubileo F, Iemmo L, Cucolo A M
Dipartimento di Fisica, Università degli Studi dell'Aquila and INFN and CNR-INFM Laboratorio Regionale CASTI, Via Vetoio, 67010 Coppito (AQ), Italy.
Nanotechnology. 2008 Oct 1;19(39):395701. doi: 10.1088/0957-4484/19/39/395701. Epub 2008 Aug 11.
The electron field emission characteristics of individual multiwalled carbon nanotubes were investigated by a piezoelectric nanomanipulation system operating inside a scanning electron microscopy chamber. The experimental set-up ensures a precise evaluation of the geometric parameters (multiwalled carbon nanotube length and diameter and anode-cathode separation) of the field emission system. For several multiwalled carbon nanotubes, reproducible and quite stable emission current behaviour was obtained, with a dependence on the applied voltage well described by a series resistance modified Fowler-Nordheim model. A turn-on field of ∼30 V µm(-1) and a field enhancement factor of around 100 at a cathode-anode distance of the order of 1 µm were evaluated. Finally, the effect of selective electron beam irradiation on the nanotube field emission capabilities was extensively investigated.
利用在扫描电子显微镜腔室内运行的压电纳米操纵系统，研究了单个多壁碳纳米管的电子场发射特性。该实验装置确保了对场发射系统几何参数（多壁碳纳米管长度、直径以及阳极 - 阴极间距）的精确评估。对于几根多壁碳纳米管，获得了可重复且相当稳定的发射电流行为，其对施加电压的依赖性可用串联电阻修正的福勒 - 诺德海姆模型很好地描述。在阴极 - 阳极距离约为1 µm时，评估得到的开启场约为30 V µm⁻¹，场增强因子约为100。最后，广泛研究了选择性电子束辐照对纳米管场发射能力的影响。
