A Z‐scheme heterojunction with high separation efficiency of photogenerated electrons and holes and enhanced reduction/oxidation potentials, which can enhance reactive oxygen species generation and photothermal conversion efficiency, exhibits tremendous potential in photonic theranostics. Herein, antimonene nanosheets (Sb NSs) are functionalized with photosensitizer 5,10,15,20‐Tetrakis(4‐hydroxy‐phenyl)‐21H,12H‐porphine (THPP) and a poly(ethylene glycol) (PEG) modifier. The Sb–THPP–PEG NSs thus fabricated are found to form a Z‐scheme heterojunction structure between Sb and THPP, based on their valence band and bandgap level analysis. The Z‐scheme heterojunction structure enables the Sb–THPP–PEG NSs multiple promising features for cancer therapy. Firstly, due to improved electron–hole pairs separation efficiency and redox potential, new reactive oxygen species •O₂⁻ is generated, besides the production of ¹O₂ by THPP. Secondly, the assembly of THPP enhances the NIR‐light‐to‐heat conversion of Sb NS, a photothermal conversion efficiency as high as 44.6% is obtained by this Sb–THPP–PEG NSs photonic nanomedicine. Moreover, the photothermal, fluorescent, and photoacoustic imaging properties of Sb–THPP–PEG NSs allow multimodal imaging‐guided tumor treatment.

中文翻译：

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基于锑纳米片的Z方案异质结构，具有增强的活性氧生成和光热转换效率，可用于癌症的光子治疗。

具有光生电子和空穴的高分离效率和增强的还原/氧化电势的AZ方案异质结，可以增强活性氧的产生和光热转换效率，在光子治疗论中显示出巨大的潜力。在此，锑光纳米片（Sb NSs）用光敏剂5,10,15,20-四（4-羟基-苯基）-21H，12H-卟啉（THPP）和聚（乙二醇）（PEG）改性剂进行功能化。基于它们的价带和带隙能级分析，发现如此制造的Sb-THPP-PEG NSs在Sb和THPP之间形成Z型异质结结构。Z方案异质结结构使Sb–THPP–PEG NSs具有多种有望用于癌症治疗的特征。首先，由于提高了电子-空穴对的分离效率和氧化还原电位，₂ ^-产生，除了生产¹ ö ₂由THPP。其次，THPP的组装增强了Sb NS的近红外-光热转换，这种Sb–THPP–PEG NSs光子纳米药物的光热转换效率高达44.6％。此外，Sb–THPP–PEG NSs的光热，荧光和光声成像特性允许多模态成像指导的肿瘤治疗。