Aspects of the invention are directed to a method for forming a hybrid structure. Initially, a wire is received and an encapsulating film is deposited on the wire. Subsequently, the wire is selectively removed to leave a hollow tube formed of the encapsulating film. A plurality of active particles are then placed into the hollow tube by immersing the hollow tube in a suspension comprising the plurality of active particles and a liquid. Lastly, the hollow tube and the plurality of active particles therein are removed from the suspension and allowed to dry so as to form a cluster of active particles at least partially encapsulated by the encapsulating film.