Sol gel method based method for preparing composite nano diamond thin films

The invention relates to the field of diamond thin film preparation and discloses a sol-gel method-based method for preparing composite nano diamond thin films, which comprises the following steps: a,preparing composite nano diamond slurry; b, whirl coating by using a sol-gel method; c, performing thermal sintering treatment after whirl coating; and d, performing surface treatment and annealing treatment. The method is simple in process and low in cost; the prepared composite nano diamond thin film is stable and uniform; and the method is suitable to be used in application fields of frictional wear, cold cathode field emission, micro electro mechanical system (MEMs), electrochemical inert electrode, optical coating and the like.