NIR‐II Responsive Inorganic 2D Nanomaterials for Cancer Photothermal Therapy: Recent Advances and Future Challenges

Abstract Non‐invasive cancer photothermal therapy (PTT) is a promising replacement for traditional cancer treatments. The second near‐infrared region induced PTT (NIR‐II PTT, 1000–1500 nm) with less energy dissipation has been developed for deeper‐seated tumor treatment in recent years compared with the traditional first near‐infrared light (750–1000 nm). In addition, the use of emerging inorganic 2D nanomaterials as photothermal agents (PTAs) further enhanced PTT efficiency due to their intrinsic photothermal properties. NIR‐II light stimulated inorganic 2D nanomaterials for PTT is becoming a hot topic in both academic and clinical fields. This review summarizes the categories, structures, and photothermal conversion properties of inorganic 2D nanomaterials for the first time. The recent synergistic strategies of NIR‐II responsive PTT combined with other treatment approaches including chemotherapy, chemodynamic therapy, photodynamic therapy, radiotherapy are summarized. The future challenges and perspectives on these 2D nanomaterials for NIR‐II responsive PTT systems construction are further discussed.