Emerging Nanotechnologies for Manufacturing, 2nd Edition

1335.1 Introduction

FIGURE 5.4 Nanotube Catalyst-Bed Formation.

(i) Generalized CNT growth. (ii) Routes to catalyst nanoisland formation; (a) Deposition

of wet catalyst (e.g., ferritin, metallic salts, and ferrocene). (b) Plasma, or wet etching

of materials such as steel, or physical vapor deposited (PVD) thin films. (c) Thermal

coalescence of a PVD thin film. (iii) Catalyst wetting behavior. The degree of wetting

determines the adopted root or tip growth mechanism. Illustrations of nanoisland: (a)

wetting and (b) dewetting. (iv) Ostwald ripening: catalyst formation and coalescence

occurring during increasing temperature and/or annealing duration. ...