Fig. 6

TEM analysis. TEM images of a Tri-COF-DAB, b Tetra-COF-DAB, c Tri-COF-BZ, and d Tetra-COF-BZ. The insets in the upper right corners are magnified images from their corresponding red squares

TEM analysis. TEM images of a Tri-COF-DAB, b Tetra-COF-DAB, c Tri-COF-BZ, and d Tetra-COF-BZ. The insets in the upper right corners are magnified images from their corresponding red squares