Size-controlled in situ synthesis of metal nanoparticles on dendrimer-modified carbon nanotubes
Size-controlled in situ synthesis of metal nanoparticles on dendrimer-modified carbon nanotubes
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DOI：
10.1021/jp065613y
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发表时间：
2007-02-15
影响因子：
3.7
通讯作者：
Imae, Toyoko
中科院分区：
文献类型：
--
作者：
Lu, Xing;Imae, Toyoko
采用第四代氨基封端的聚酰胺-胺（G4-PAMAM）树枝状大分子（CNT/DEN）对多壁碳纳米管（MWCNTs）进行共价修饰。通过红外吸收光谱法鉴定CNT和树枝状聚合物之间的共价键，并且通过热重分析确定CNT/DEN中G4-PAMAM树枝状聚合物的重量含量为约40重量%。通过简单地调节金属离子与树枝状大分子末端胺的比例，原位合成了不同尺寸的Au纳米颗粒（NPs），并将其沉积在CNT/DEN表面，通过透射电子显微镜（TEM）和紫外-可见（UV-vis）吸收光谱证实了这一点。此外，许多金属纳米粒子以外的Au纳米粒子，如银，铜，铂纳米粒子，以及二元纳米粒子的Ag@Au，原位合成CNT/DEN，这是确定与TEM和紫外-可见光谱，以及能量色散X-射线光谱，产生水分散性和稳定的CNT/DEN/纳米粒子。
Multiwalled carbon nanotubes (MWCNTs) were covalently modified with fourth-generation NH2-terminated poly(amido amine) (G4-PAMAM) dendrimers, named CNT/DEN. The covalent linkages between CNT and dendrimers were identified by an infrared absorption spectrometry, and the weight content of G4-PAMAM dendrimers in CNT/DEN was determined to be about 40 wt % by a thermal gravimetric analysis. By simply tuning the metal ion-to-dendrimer terminal amine ratio, Au nanoparticles (NPs) with different sizes from 3 to 11 nm were in situ synthesized and deposited on the surface of CNT/DEN, as confirmed by a transmission electron microscopy (TEM) and an ultra violet-visible (UV-vis) absorption spectrometry. Furthermore, many metal NPs other than Au NPs, such as Ag, Cu, and Pt NPs, as well as binary NPs of Ag@Au, were synthesized in situ on CNT/DEN, which were identified with TEM and UV-vis spectrometry, as well as an energy-dispersion X-ray spectroscopy, yielding the water-dispersible and stable CNT/DEN/NPs.