一種基於固態合成的嶄新系列取代B位置之不同分子層數厚度的二維鈣鈦礦Ruddlesden–Popper相 Can-1Mnn-3Nb3O3n+12- (CMNO2-) 奈米片狀材料，可應用於太陽光電水分解產氫氣和自旋電子裝置中。我們採用了位於第一過渡系的過渡金屬-錳Mn原子取代部分八面體鈣鈦礦結構中的鈮酸鹽 (NbO6) B-Site之Nb 元素位置，成功地合成出Ruddlesden–Popper相的二維層狀鈣鈦礦家族結構。這些奈米片的晶體結構、形態和光學特性與寬能隙(3.02~3.23eV)的特性，使其在高效氫氣生產方面的潛在應用，以實現永續能源技術。本研究將合成出不同層數（n = 4、5、6）的Ruddlesden-Popper (RP) 相Can-1Mnn-3Nb3O3n+12- (CMNO2-) 鈣鈦礦奈米片進行了系統探索，透過取代B位置和化學剝離方法來調整其物理化學性質和催化性能。其中CMNO2-（n =6）分子層數的奈米片有最優異的產氫效率。將CMNO2-奈米片與導電聚合物PEDOT:PSS複合形成p-n接面可有效增強產氫效率，在一種增強其光吸收的新方法中，小球藻微藻被塗覆於CMNO2- 奈米片與PEDOT:PSS複合形成的p-n接面電極上，在起始電位和電流密度方面，皆表現出顯著的改善，特別是對於CMNO2- (n = 6 )的電極試片。
此外，進一步研究鐵磁性過渡金屬氧化物與其層狀奈米片磁性轉變特性和施加外部磁場來提高光催化性能，室溫下可藉由外加電場調控磁性，其自旋極化電子提供了提高光催化電解水產氫之有效策略。使用雷射光圓偏振極化(ħ/-ħ)進行水分解產氫的研究，透過磁性(Mn)元素的協同摻雜和自旋極化，增加了光激發載流子的數量，從而延長了載流子壽命並抑制了電荷複合。結果表明磁性斯格明子（skyrmion）可形成於取代B位置之Can-1Mnn-3Nb3O3n+12-二維鈣鈦礦過渡金屬氧化物之n = 6分子層數厚度的奈米片中，操縱光催化半導體中的自旋極化電子可應用於未來永續能源中。此實驗顯示CMNO2-二維鈣鈦礦奈米片可應用於光催化電解水產氫裝置。

A neoteric B-site series of Ruddlesden-Popper phases based on solid-state synthesis, consisting of varying molecular thicknesses numbers, denoted as Can-1Mnn-3Nb3O3n+12- (n=4,5,6) nanosheets, has been successfully synthesized. These nanosheets can be applied in solar photocatalytic water splitting for hydrogen production and spintronic devices. We successful synthesis of Ruddlesden-Popper phase layered perovskites by partially substituting niobium in the octahedral NbO6 structure with transition metal manganese atoms, located at the B-site. The properties of these nanosheets, characterized by wide bandgaps (3.02~3.23 eV), demonstrate their potential application in efficient hydrogen production for sustainable energy technologies. This study explores different layer numbers of Can-1Mnn-3Nb3O3n+12- (CMNO2-) to adjust their physicochemical properties and catalytic performance through B-site substitution and exfoliation methods. Among them, CMNO2- (n=6) nanosheets exhibit superior hydrogen evolution efficiency. Incorporating CMNO2- nanosheets with the conductive polymer PEDOT:PSS to form p-n junctions effectively enhances hydrogen production. A novel approach to enhance light absorption involves coating Chlorella vulgaris microalgae onto CMNO2- nanosheets electrode surface, leading to significant improvements in onset potential and current density, particularly for CMNO2- (n=6) nanosheets. Furthermore, the study investigates ferromagnetism transition metal oxides and its magnetic transition properties with dependance increasing layered numbers. External magnetic fields and manipulating magnetic properties at room temperature by applying an external electric field provides an effective strategy for enhancing photocatalytic performance by spin-polarized electrons. Circularly polarized light is used for hydrogen evolution, increasing spin-polarized photoexcited carriers, extending carrier lifetimes, and suppressing charge recombination. Results indicate the formation of magnetic skyrmions within CMNO2- (n=6) nanosheets, suggesting that manipulating spin-polarized electrons in photocatalytic semiconductors can be applied to future sustainable energy production. CMNO2- nanosheets show promising applications in solar photocatalytic water splitting for hydrogen production.

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