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Improving the photothermal therapy efficacy and preventing the surface oxidation of bismuth nanoparticles through the formation of a bismuth@bismuth selenide heterostructure.
Journal of Materials Chemistry B ( IF 6.1 ) Pub Date : 2020-08-14 , DOI: 10.1039/d0tb00825g Bing Li 1 , Yan Cheng 2 , Runxiao Zheng 2 , Xiaqing Wu 2 , Fan Qi 2 , Yunyun Wu 3 , Yaqing Hu 1 , Xi Li 1
Journal of Materials Chemistry B ( IF 6.1 ) Pub Date : 2020-08-14 , DOI: 10.1039/d0tb00825g Bing Li 1 , Yan Cheng 2 , Runxiao Zheng 2 , Xiaqing Wu 2 , Fan Qi 2 , Yunyun Wu 3 , Yaqing Hu 1 , Xi Li 1
Affiliation
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Bismuth (Bi) nanoparticles (NPs) are emerging as promising photothermal agents for computed tomography imaging-guided photothermal therapy. However, it is challenging to improve their photothermal conversion efficacy and prevent their oxidation. Herein, Bi@bismuth selenide (Bi2Se3) core@shell NPs were designed and fabricated for improving the photothermal performance due to the staggered energy levels between Bi and Bi2Se3. With near-infrared light irradiation, both the materials could be excited to generate hot carriers due to their extremely narrow bandgaps. The hot electrons would transfer to the conduction band of Bi2Se3 and the hot holes to the valence band of Bi, leading to the effective separation of hot carriers. Then, these hot electrons and holes would recombine nonradiatively at the interface of Bi and Bi2Se3 and produce more phonons, resulting in an enhanced photothermal conversion efficacy. Moreover, the presence of Bi2Se3 on the surface of Bi NPs could prevent Bi from surface oxidation due to the higher stability of Bi2Se3. In fact, Bi@Bi2Se3 NPs showed excellent biocompatibility and photothermal therapeutic efficacy against cancer cells.
中文翻译：
通过形成硒化铋@铋异质结构来提高光热疗法的疗效并防止铋纳米粒子的表面氧化。
铋（Bi）纳米粒子（NPs）逐渐成为有前途的光热剂，用于计算机断层扫描成像引导的光热疗法。然而，提高其光热转化效率并防止其氧化是具有挑战性的。在此，设计并制造了Bi @ Bi硒化铋（Bi 2 Se 3）核壳NP，以改善Bi和Bi 2 Se 3之间的能级，从而提高光热性能。在近红外光照射下，由于它们的极窄的带隙，两种材料都可能被激发生成热载流子。热电子将转移到Bi 2 Se 3的导带以及Bi价带的热孔，导致热载流子的有效分离。然后，这些热电子和空穴将在Bi和Bi 2 Se 3的界面非辐射地复合，并产生更多的声子，从而提高了光热转换效率。此外，Bi的存在2硒3的Bi NP的表面上可以防止铋从表面氧化，由于Bi的更高的稳定性2硒3。实际上，Bi @ Bi 2 Se 3 NPs对癌细胞具有优异的生物相容性和光热治疗功效。
更新日期：2020-10-07
中文翻译：
通过形成硒化铋@铋异质结构来提高光热疗法的疗效并防止铋纳米粒子的表面氧化。
铋（Bi）纳米粒子（NPs）逐渐成为有前途的光热剂，用于计算机断层扫描成像引导的光热疗法。然而，提高其光热转化效率并防止其氧化是具有挑战性的。在此，设计并制造了Bi @ Bi硒化铋（Bi 2 Se 3）核壳NP，以改善Bi和Bi 2 Se 3之间的能级，从而提高光热性能。在近红外光照射下，由于它们的极窄的带隙，两种材料都可能被激发生成热载流子。热电子将转移到Bi 2 Se 3的导带以及Bi价带的热孔，导致热载流子的有效分离。然后，这些热电子和空穴将在Bi和Bi 2 Se 3的界面非辐射地复合，并产生更多的声子，从而提高了光热转换效率。此外，Bi的存在2硒3的Bi NP的表面上可以防止铋从表面氧化，由于Bi的更高的稳定性2硒3。实际上，Bi @ Bi 2 Se 3 NPs对癌细胞具有优异的生物相容性和光热治疗功效。
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