本文研究了類花弁(confeito-like)納米粒子(CAuNPs), 以及其與二氧化鈦(TiO2)混合物(CAuNP/TiO2)的合成和等離子體光催化作用(plasmonic photocatalysis), CAuNP/TiO2的混合物主要利用Ti-檸檬酸鹽-過氧化物在不同的條件(黑暗, UV, 可見光), 以及比較不同時間(24,48小時)。其中在黑暗的條件下，TiO2緩慢的形成，而在可現光的條件下，有TiO2的膜狀結構形成，並且覆蓋在CAuNPs。此效應與CAuNPs分解Ti-檸檬酸鹽-過氧化物地等離子體行為有關。另外，此研究也做了對TiO2參雜不同的非金屬(N,S)和過度金屬(V,Fe,Cu)。CAuNPs以及其納米複合材料被應用於光降解亞甲基藍(MB)於不同的條件下(黑暗, UV, 可見光)，並測試其光催化活性。從結果發現，裸CAuNPs只能夠在可見光的情況下分解MB，主要由於等離子體激元誘導的電荷分離。TiO2可以增強活性，主要因為通過將熱墊子從CAuNP轉移到TiO2，此現象可視為TiO2仰制了電子(e-)與電洞(h+)的重組速率。但過量的TiO2可以覆蓋CAuNPs的尖端，並降低活性。通過在TiO2中參雜氮(N)和硫(S)可以進一步改善光催化活性，參雜的作用被認為可以讓TiO2的能階變窄。其中S的參雜比N-的參雜更加有效，主要因為吸附在Au表面上的硫與硫酸根(SO42-)有電子轉移。另一方面，過度金屬釩(V),鐵(Fe),銅(Cu)的參雜並沒有明顯的改變光催化的活性，這種低效率可能因為不同的因素，可能與TiO2 的電子電洞的重組有關。

In this work, the synthesis and plasmonic photocatalysis of confeito-like gold nanoparticles (CAuNPs) and their hybrids with TiO2 (CAuNP/TiO2) were studied. The TiO2 was prepared from the Ti-citrate-peroxo complex, and deposited on the CAuNPs under different conditions (darkness, UV and visible light) and time spans (24h and 48h). While the deposition of TiO2 under darkness was slow, the visible light irradiation resulted in the film formation to embed the CAuNPs as aggregates. These effects were associated with the plasmonic behavior of CAuNP to decompose the Ti-citrate-peroxo complex. To the TiO2, different non-metals (N, S) and transition metals (V, Fe, Cu) were also doped. Then, the CAuNPs and their nanocomposites were used as photocatalysts. The photocatalytic activity was measured by the degradation of methylene blue (MB) under different conditions (darkness, UV and visible light). The results demonstrated that the bare CAuNPs was able to decompose MB solely under visible light, which was explained by the plasmon-induced charge separation. The activity was further enhanced by the TiO2, and there was an optimum amount of TiO2. The role of TiO2 was considered to suppress the recombination rate of electron and hole (e- and h+) by transferring hot electrons from CAuNPs to TiO2. The excess TiO2 could cover the tips of CAuNPs, and then reduce the activity. A synergistic relation between the synthesized condition and the photocatalytic activity was also observed as a self-optimization to facilitate the electron transfer. The photocatalytic activity could be further improved by nitrogen (N) and sulfur (S) doping in TiO2. The roles of dopants were considered as attributed to the band gap narrowing of TiO2. The S-doping was more effective than N-doping because the sulfur and the sulfate ion (SO42-) adsorbed on Au surface mediated the electron transfer. On the other hand, the doping of transition metals, vanadium (V), iron (Fe) and copper (Cu) did not significantly change the photocatalytic activity. The reason behind this low efficiency could be attributed to different factors: The formation of interstates between VB and CB of TiO2 acted as a recombination center and contributed to the lower photocatalytic activity.

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