NOVELTY - A method for depositing metal or metal oxide particles onto a substrate involves providing a metal or metal oxide suspension, electrospraying the suspension onto the substrate; and drying the sprayed substrate to deposit metal or metal oxide particles onto the substrate.    USE - For depositing metal or metal oxide particles onto a substrate; producing nanometer diameter metal oxide particles deposited on electrospun nano fibers on a matrix (claimed); and in biomedical applications, such as artificial tissues and scaffolds, electronic applications, such as electronic packaging, sensors, actuators and fuel cells, and filtration systems, such as filtration media and biological and chemical protection systems.    ADVANTAGE - The use of nanosized particles increases the number of particles per unit area, and thus the antimicrobial effect maximizes. The electrospraying process enables a more uniform particle size distribution and avoids substantial agglomeration of the metal oxide particles. The resultant deposited material is highly flexible, thus enables the material to be incorporated in movable and bendable structures and flexible membranes, such as textiles and fabrics. Additionally, the deposited material is fabricated to produce any desired pore size, including nanometer or micrometer sized pores suitable for fine filtration applications. The metal oxides have photocatalytic properties to enable antimicrobial applications. The electrospraying process is incorporated as part of a fabrication method which employs electrospinning of a polymeric material to provide at least a portion of the substrate.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a process (P1) of producing nanometer diameter metal oxide particles deposited on electrospun nano fibers on a matrix involving electrospinning of a polymer solution onto a matrix; electrospraying a metal oxide suspension onto the electrospun nanofibers; and drying the electrosprayed metal oxide suspension; and    (2) a metal or metal oxide deposited fibrous material (M1) made by the process (P1) comprising a matrix having pores; fibers supported by or bound to the matrix; and metal or metal oxide particles dispersed on a surface of the matrix, where substantially all of the metal or metal oxide particles have a diameter of less than 100 nm and the metal or metal oxide particles do not block the pores.