Quarta Danila, Toso Stefano, Giannuzzi Roberto, Caliandro Rocco, Moliterni Anna, Saleh Gabriele, Capodilupo Agostina-Lina, Debellis Doriana, Prato Mirko, Nobile Concetta, Maiorano Vincenzo, Infante Ivan, Gigli Giuseppe, Giannini Cinzia, Manna Liberato, Giansante Carlo
Consiglio Nazionale delle Ricerche, Istituto di Nanotecnologia, CNR NANOTEC, Via Monteroni, 73100, Lecce, Italy.
Dipartimento di Matematica e Fisica 'Ennio De Giorgi', Università del Salento, Via per Arnesano, 73100, Lecce, Italy.
Angew Chem Int Ed Engl. 2022 May 23;61(22):e202201747. doi: 10.1002/anie.202201747. Epub 2022 Mar 10.
Here we present a colloidal approach to synthesize bismuth chalcohalide nanocrystals (BiEX NCs, in which E=S, Se and X=Cl, Br, I). Our method yields orthorhombic elongated BiEX NCs, with BiSCl crystallizing in a previously unknown polymorph. The BiEX NCs display a composition-dependent band gap spanning the visible spectral range and absorption coefficients exceeding 10 cm . The BiEX NCs show chemical stability at standard laboratory conditions and form colloidal inks in different solvents. These features enable the solution processing of the NCs into robust solid films yielding stable photoelectrochemical current densities under solar-simulated irradiation. Overall, our versatile synthetic protocol may prove valuable in accessing colloidal metal chalcohalide nanomaterials at large and contributes to establish metal chalcohalides as a promising complement to metal chalcogenides and halides for applied nanotechnology.
在此，我们展示了一种用于合成卤族元素铋化物纳米晶体（BiEX NCs，其中E = S、Se且X = Cl、Br、I）的胶体方法。我们的方法可生成正交晶系的细长BiEX NCs，其中BiSCl以一种先前未知的多晶型结晶。BiEX NCs表现出与成分相关的带隙，覆盖可见光谱范围，且吸收系数超过10 cm⁻¹。BiEX NCs在标准实验室条件下具有化学稳定性，并能在不同溶剂中形成胶体墨水。这些特性使得NCs能够通过溶液加工制成坚固的固体薄膜，在模拟太阳光照射下产生稳定的光电化学电流密度。总体而言，我们通用的合成方案可能在大规模制备胶体金属卤族元素化合物纳米材料方面具有重要价值，并有助于确立金属卤族元素化合物作为金属硫族化物和卤化物在应用纳米技术中的有前景的补充材料。
