Isolation and characterization of fluorescent nanoparticles from pristine and oxidized electric arc-produced single-walled carbon nanotubes
Isolation and characterization of fluorescent nanoparticles from pristine and oxidized electric arc-produced single-walled carbon nanotubes
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DOI：
10.1021/jp055503b
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发表时间：
2006-01-19
影响因子：
3.3
通讯作者：
Mustelin, T
中科院分区：
文献类型：
--
作者：
Bottini, M;Balasubramanian, C;Mustelin, T
荧光纳米颗粒是从原始的和硝酸氧化的市售碳纳米管中分离出来的，这些碳纳米管是通过电氧化法生产的。原始的和氧化的碳纳米管衍生的荧光纳米颗粒分别在紫蓝色和蓝色到黄绿色范围内表现出分子量依赖的光致发光。光致发光的分子量依赖性与特定供体密切相关。我们分析了来自同一供应商的原始和氧化纳米管的荧光纳米颗粒的组成和形态。我们发现分离的荧光材料主要由钙和锌组成。此外，原始碳纳米管衍生的荧光纳米颗粒具有疏水性，最大横向尺寸分布狭窄。相比之下，氧化碳纳米管衍生的荧光纳米颗粒表面被氧化和/或被薄碳层包裹，分散在水中时具有聚集能力，并且表现出更广泛的最大横向尺寸分布。
Fluorescent nanoparticles were isolated from both pristine and nitric acid-oxidized commercially available carbon nanotubes that had been produced by an electric are method. The pristine and oxidized carbon nanotube-derived fluorescent nanoparticles exhibited a molecular-weight-dependent photoluminescence in the violet-blue and blue to yellowish-green ranges, respectively. The molecular weight dependency of the photoluminescence was strongly related to the specific supplier. We analyzed the composition and morphology of the fluorescent nanoparticles derived from pristine and oxidized nanotubes from one supplier. We found that the isolated fluorescent materials were mainly composed of calcium and zinc. Moreover, the pristine carbon nanotube-derived fluorescent nanoparticles were hydrophobic and had a narrow distribution of maximal lateral dimension. In contrast, the oxidized carbon nanotube-derived fluorescent nanoparticles were superficially oxidized and/or coated by a thin carbon layer, had the ability to aggregate when dispersed in water, and exhibited a broader distribution of maximal lateral dimension.