화학공학소재연구정보센터
Journal of Chemical Thermodynamics, Vol.33, No.3, 333-345, 2001
Enthalpies of adsorption of metal atoms on single-crystalline surfaces by microcalorimetry
The heats of adsorption of metal gas atoms onto single crystalline surfaces can be measured directly as a detailed function of coverage using a unique microcalorimeter. The development of this experimental apparatus and the results obtained from these experiments will be reviewed. The heat detection is performed with a highly sensitive pyroelectric polymer ribbon pressed into contact with the thin (1 mum thick) single crystal sample, onto which pulses of a metal atom beam impinge. Heats of adsorption have been measured for pulses of gas containing a few per cent of a monolayer with a pulse-to-pulse standard deviation as low as 1.5 kJ.mol(-1). The adhesion energy of multilayer metal films can be estimated from the integral enthalpy of adsorption.