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HAADF-STEM images of sample C75SA, illustrating the range of particle shapes. (a) Small elongated CuPT crystals individually coated by porous silica. (b) Elongated CuPT crystals protruded from a large irregular cluster. (c) Silica-coated CuPT crystals and small silica residues. (d) Elongated CuPT crystals inside larger silica aerogel structures. (e) EDS line scan analysis of a single rectangular particle. The yellow arrow on the STEM image indicates the position of the scanned line.
