NOVELTY - A carbon nanotube-metal particle composite (C1) (100) comprises: carbon nanotubes (102), polymer layer (104), and metal particles (106), where the polymer layer is coated on a surface of the carbon nanotubes and defines several uniformly distributed pores, and the metal particles are located in the pores.    USE - As carbon nanotube-metal particle composite for catalyst (claimed) useful in different devices, such as electrochemical reactors (e.g. membrane reactor using oil energy) and cells (e.g. fuel cells).    ADVANTAGE - The carbon nanotube-metal particle composite has a relatively small diameter of the metal particles meanwhile having the metal particles well dispersed. In the carbon nanotube-metal particle composite of the catalyst, the carboxyl groups can strongly adsorb the metal particles, thereby increasing a loading quantity of the metal particles in the catalyst. The metal particles are uniformly dispersed in the carbon nanotube-metal particle composite, thereby increasing a utilization rate of the catalyst, and thus a catalyst property of the catalyst is improved. The method for making the carbon nanotube-metal particle composite is simple. In the method, the metal particles are slowly reduced, thus a shape of the metal particles can be easily controlled.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a carbon nanotube-metal particle composite (C2) comprising: carbon nanotubes, polymer layer, and metal particles, where the polymer layer is coated on a surface of the carbon nanotubes, and the metal particles are partly inserted in the polymer layer and exposed out from the polymer layer; and    (2) a catalyst comprising: the carbon nanotube-metal particle composite (C1).    DESCRIPTION OF DRAWING(S) - The figure shows a structural schematic view of the carbon nanotube-metal particle composite.    Carbon nanotube-metal particle composite (100)    Carbon nanotubes (102)    Polymer layer (104)    Metal particles (106)