Probing Photocatalytic Active Sites on a Single Titanosilicate Zeolite with a Redox‐Responsive Fluorescent Dye

Direct Imaging of Highly Anisotropic Photogenerated Charge Separations on Different Facets of a Single BiVO4 Photocatalyst

“…However,a si ndicated by theoretical calculations in the literatures,the mobility difference of charge carriers between the different facets should also be considered. Single-particle fluorescence microscopy [25] was used to determine whether these photoinduced holes can participate in the photooxidation ( Figure S3). In addition, it should be noted that there is nearly no SPV signal on the {010} facet of BV02.…”

“…Obviously,t he result suggests that BV02 presents highly anisotropic charge distributions when excited with light, as shown schematically in Figure 4c.The present results further reveal that BiVO 4 crystals with preferentially exposed {010} facets show bigger difference in the strength of the built-in electric field between the two facets than is the case for BV01 crystals (shown in Figure 4d). Single-particle fluorescence microscopy [25] was used to determine whether these photoinduced holes can participate in the photooxidation ( Figure S3). Theb right fluorescence features on the {011} facets BV01 and BV02 further demonstrated that the In summary,s patially resolved surface photovoltage spectroscopy was employed to obtain direct evidence for anisotropic photoinduced charge transfer between different facets of as ingle semiconductor crystal.…”

Direct Imaging of Highly Anisotropic Photogenerated Charge Separations on Different Facets of a Single BiVO4 Photocatalyst

“…Single‐particle fluorescence microscopy25 was used to determine whether these photoinduced holes can participate in the photooxidation (Figure S3). The bright fluorescence features on the {011} facets BV01 and BV02 further demonstrated that the anisotropic photogenerated hole transfer observed by SRSPS on the {011} facet can oxidize probe molecules.…”

Catalytic Kinetics of Different Types of Surface Atoms on Shaped Pd Nanocrystals

“…[1] However,s tudy is often hampered by the difficulty of identifying the properties or roles of different types of surface atoms,s uch as the plane,e dge,o rc orner atoms on as ingle nanoparticle surface. [11][12][13][14][15][16][17][18][19] Furthermore,t he activity of different parts of an individual nanocatalyst (from af ew hundred nanometers to microns in size) was visualized approximately using super-resolution fluorescence microscopy. [11][12][13][14][15][16][17][18][19] Furthermore,t he activity of different parts of an individual nanocatalyst (from af ew hundred nanometers to microns in size) was visualized approximately using super-resolution fluorescence microscopy.…”

“…[2][3][4] To elucidate this problem, various experiments and computations have been conducted, [2,[4][5][6][7][8][9][10] but it is still difficult to clarify the quantitative contribution of different types of surface atoms to the total catalytic reactivity of as ingle nanoparticle.I nr ecent years,s inglemolecule fluorescence microscopy (SMFM) has been used to investigate the kinetic and dynamic behaviors of the whole single nanoparticles in real time with single-turnover resolution. [11][12][13][14][15][16][17][18][19] Furthermore,t he activity of different parts of an individual nanocatalyst (from af ew hundred nanometers to microns in size) was visualized approximately using super-resolution fluorescence microscopy. [20][21][22] However,o wing to the limitation of spatial resolution and the vague partition of corner,e dge,o rp lane on individual nanocatalysts,t he catalytic kinetic and dynamic study of different types of surface atoms cannot be studied quantitatively with SMFM.In this work, based on well-defined palladium (Pd) nanocubes and rational physical models,b yastatistical quantitative deconvolution of observables obtained from traditional single-molecule nanocatalysis of Pd nanocrystals, the catalytic kinetics and dynamics of the different types of surface atoms (plane and edge) were studied quantitatively for the first time.T his work pushes traditional SMFM as tep forward to sub-particle level.…”