Conventional fluorescence microscopy is limited by the optical diffraction of light, which results in a spatial resolution of about half of the light’s wavelength, approximately to 250–300 nm. The spatial resolution restricts the utilization of microscopes for studying subcellular structures. In order to improve the resolution and to shatter the diffraction limit, two general approaches were developed: a spatially patterned excitation method and a single-molecule localization strategy. The success of super-resolution imaging relies on bright and easily accessible fluorescent probes with special properties. Carbon dots, due to their unique properties, have been used for super-resolution imaging. Considering the importance and fast development of this field, this work focuses on the recent progress and applications of fluorescent carbon dots as probes for super-resolution imaging. The properties of carbon dots for super-resolution microscopy (SRM) are analyzed and discussed. The conclusions and outlook on this topic are also presented.

Utilizing sunlight as a driving force in chemical reactions is a great benefit for a sustainable future. Metal‐based composites are basic components in various catalytic reactions. However, few researches reported carbon nitride‐supported Pd nanoparticles in photocatalytic coupling reactions. This study reports the preparation of a graphitic‐carbon nitride system (C3N5) followed by modification with various amounts of Pd nanoparticles. The C3N5 was synthesized by thermal deammoniation of melem hydrazine precursor and then modified by Pd cations to create a metallic composite. Regarding the N‐rich surface of C3N5, Pd2+ cations are rapidly reduced to Pd nanoparticles in mild conditions, which is strongly supported by X‐ray photoelectron spectroscopy (XPS) and X‐ray diffraction (XRD) analyses. Moreover, field emission scanning electron microscopy (FESEM) and high‐resolution transmission electron microscopy (HRTEM) analyses clearly depicted the formation of 20 nm Pd nanoparticles on the surface of C3N5. The obtained Pd/C3N5 composite exhibited prominent photocatalytic performance for Suzuki‐Miyaura coupling reactions (91% during 25 min at room temperature). This study also compares the effect of various amounts of Pd cation in the progress of Suzuki‐Miyaura coupling reactions.