To date, a variety of graphitic nanomaterial-based applications have facilitated the development of biomedical applications, such as carbon quantumdot-based biosensors and imaging systems, [14][15][16][17] graphene oxide-based biosensors [18][19][20][21][22] and drug delivery systems, [20,[23][24][25] and carbon nanotube-based therapy applications. [26][27][28][29] Compared with other widely used nanomaterials, graphitic nanomaterials show superior fluorescence quenching performance, larger Raman scattering cross-sections than conventional organic Raman tags, [30] and better biocompatibility. [31] With the goal of broadening their applications, great attention has been focused on integrating graphitic materials with other inorganic nanomaterials such as noble metals [32,33] and magnetic nanomaterials. [34,35] Such graphitic nanomaterial-metal hybrid nanostructures make full use of the excellent properties of both graphitic and metal nanomaterials, and have much wider application prospect in bioanalysis. [36] However, most of the reported hybrid nanostructures, in which metal nanomaterials are exposed on the surface of graphitic nanomaterials encounter difficulty in maintaining their morphologies and stable properties under harsh conditions, such as long-term laser irradiation or strong acidic environments, which might cause inaccurate bioanalytical results and even potential biotoxicity. [37][38][39] Therefore, it is critical to prepare novel graphitic nanomaterials with superstability to meet the demands of reliable bioanalysis and biomedicine.As a type of novel graphite nanomaterial with a core-shell structure, superior physicochemical properties, good biocompatibility, superior stability, and controllable size, graphitic nanocapsules have been extensively applied in biosensing, [40,41] bioimaging, [42,43] drug delivery, [43,44] and cancer treatment. [45] Benefiting from the large surface area of the outside graphitic shell, graphitic nanocapsules supply superior nanoplatforms for drugs and targeting-molecule loading, which further broadens their biomedical applications. [42,44,46] In addition, the graphitic shell of graphitic nanocapsules possesses several unique Raman scattering bands and can act as a Raman signal tag or stable internal standard (IS) for accurate surface enhanced Raman scattering (SERS) analysis. [46,47] Particularly, the 2D band (≈2650 cm −1 ) within the cellular Raman-silent region is beneficial to avoiding the interference signals from Benefiting from their unique physicochemical properties, graphitic nanocapsules with a core-shell structure have attracted tremendous interest in bioanalysis and biomedicine recently. Using rational design, various types of graphitic nanocapsules with controllable properties are prepared to meet the demands of different biomedical applications. Graphitic nanocapsules exhibit excellent stability and superior capacity for loading nucleic acids, proteins, small molecules, and drugs due to the large specific surface area of their graphitic shells. Moreover, usin...