▎ 摘　　要

To investigate the effect of resonant thermal radiation from electric graphene films (GFs) to the immunoactivity of T cells in situ and the benefits to cancer immunotherapy. This work utilizes externally applied GFs to regulate the immunoactivity of T cells through the eminent resonant thermal radiation effect. The GFs are fabricated with high emissivity and well-matched far-infrared emission peaks between the GFs and living bodies. The T-cell antigen receptor signaling mechanisms and the ensuing immunoactivity of T cells by GFs treatment, compared with traditional metal films (MFs), are studied both in vitro and in vivo. The resonance thermal radiation decreases the activation threshold of T cells by increasing the influx of calcium ions, neutralizing the negative charge of intracellular membranes and triggering the phospho-CD3 zeta event. As a result, GF treatment elicits an enhanced T-cell-based immune response and serves as an externally applied "adjuvant" to T-cell activation, which shows remarkable efficiency in combination with aPD-L1 immunotherapy in multiple mouse models. This work centers the unmet needs of regulating the immunoactivity of intratumoral T cells in situ, in which the auxiliary use of GFs with high efficiency and little safety concern has great promise to translational study regarding cancer immunotherapy in future.