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Mixed protein-templated luminescent metal clusters (Au and Pt) for H2O2 sensing.

Li M, Yang DP, Wang X, Lu J, Cui D - Nanoscale Res Lett (2013)

Bottom Line: A simple and cost-effective method to synthesize the luminescent noble metal clusters (Au and Pt) in chicken egg white aqueous solution at room temperature is reported.The red-emitting Au cluster is used as fluorescent probe for sensitive detection of H2O2.

View Article: PubMed Central - HTML - PubMed

Affiliation: Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, Wenzhou Medical College, Wenzhou, Zhejiang, 325035, China. boyydp@sjtu.edu.cn.

ABSTRACT
A simple and cost-effective method to synthesize the luminescent noble metal clusters (Au and Pt) in chicken egg white aqueous solution at room temperature is reported. The red-emitting Au cluster is used as fluorescent probe for sensitive detection of H2O2.

No MeSH data available.


HRTEM imaging of red-luminescent Au clusters and emission spectra of Au and Pt clusters. (a) HRTEM imaging of red-luminescent Au clusters. (b) Emission spectra of red-luminescent, pink-luminescent, and blue-luminescent Au clusters and blue-luminescent Pt cluster.
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Figure 3: HRTEM imaging of red-luminescent Au clusters and emission spectra of Au and Pt clusters. (a) HRTEM imaging of red-luminescent Au clusters. (b) Emission spectra of red-luminescent, pink-luminescent, and blue-luminescent Au clusters and blue-luminescent Pt cluster.

Mentions: The high-resolution transmission electron microscope (HRTEM) image showed the presence of metal clusters in the size of approximately 2.5 nm (in diameter) for red-emitting Au (Figure 3a), where the crystal lattice fringes are 0.23 nm, which correspond to the (111) planes of the metallic Au. We deduced that the larger sizes could be due to the continuous irradiation of high-energy electron beams, which leads to the aggregation of the clusters. We failed to observe these dark spots in the HRTEM images of pink-emitting Au, blue-emitting Au, and blue-emitting Pt, which could be attributed to their ultra-small sizes. The fluorescence emissions of the four samples are also shown in Figure 3b. A broad emission maximum at approximately 650 nm for red-luminescent Au (red curve) was shown when the 380-nm exciting wavelength is used. The broad emission could be attributed to the multiple cluster size distributions or the intricate chemical environments around the metal core as pointed out by Xavier et al. [18]. Additionally, a front emission peak at approximately 450 nm was also observed, which is confirmed to be from the egg white (data not shown). The pink-luminescent Au (pink curve) shows an emission maximum at approximately 410 nm (excitation wavelength 330 nm). The blue-luminescent Au (blue curve) and blue-luminescent Pt (green curve) show nearly the same emission maximum at approximately 350 nm. In fact, we also attempted to synthesize Ag clusters using an identical method; after 1 h of incubation, the red luminescence reached the maximum, and afterward, it gradually faded until no luminescence was observed (Additional file 1: Figure S1).


Mixed protein-templated luminescent metal clusters (Au and Pt) for H2O2 sensing.

Li M, Yang DP, Wang X, Lu J, Cui D - Nanoscale Res Lett (2013)

HRTEM imaging of red-luminescent Au clusters and emission spectra of Au and Pt clusters. (a) HRTEM imaging of red-luminescent Au clusters. (b) Emission spectra of red-luminescent, pink-luminescent, and blue-luminescent Au clusters and blue-luminescent Pt cluster.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
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getmorefigures.php?uid=PMC3643886&req=5

Figure 3: HRTEM imaging of red-luminescent Au clusters and emission spectra of Au and Pt clusters. (a) HRTEM imaging of red-luminescent Au clusters. (b) Emission spectra of red-luminescent, pink-luminescent, and blue-luminescent Au clusters and blue-luminescent Pt cluster.
Mentions: The high-resolution transmission electron microscope (HRTEM) image showed the presence of metal clusters in the size of approximately 2.5 nm (in diameter) for red-emitting Au (Figure 3a), where the crystal lattice fringes are 0.23 nm, which correspond to the (111) planes of the metallic Au. We deduced that the larger sizes could be due to the continuous irradiation of high-energy electron beams, which leads to the aggregation of the clusters. We failed to observe these dark spots in the HRTEM images of pink-emitting Au, blue-emitting Au, and blue-emitting Pt, which could be attributed to their ultra-small sizes. The fluorescence emissions of the four samples are also shown in Figure 3b. A broad emission maximum at approximately 650 nm for red-luminescent Au (red curve) was shown when the 380-nm exciting wavelength is used. The broad emission could be attributed to the multiple cluster size distributions or the intricate chemical environments around the metal core as pointed out by Xavier et al. [18]. Additionally, a front emission peak at approximately 450 nm was also observed, which is confirmed to be from the egg white (data not shown). The pink-luminescent Au (pink curve) shows an emission maximum at approximately 410 nm (excitation wavelength 330 nm). The blue-luminescent Au (blue curve) and blue-luminescent Pt (green curve) show nearly the same emission maximum at approximately 350 nm. In fact, we also attempted to synthesize Ag clusters using an identical method; after 1 h of incubation, the red luminescence reached the maximum, and afterward, it gradually faded until no luminescence was observed (Additional file 1: Figure S1).

Bottom Line: A simple and cost-effective method to synthesize the luminescent noble metal clusters (Au and Pt) in chicken egg white aqueous solution at room temperature is reported.The red-emitting Au cluster is used as fluorescent probe for sensitive detection of H2O2.

View Article: PubMed Central - HTML - PubMed

Affiliation: Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, Wenzhou Medical College, Wenzhou, Zhejiang, 325035, China. boyydp@sjtu.edu.cn.

ABSTRACT
A simple and cost-effective method to synthesize the luminescent noble metal clusters (Au and Pt) in chicken egg white aqueous solution at room temperature is reported. The red-emitting Au cluster is used as fluorescent probe for sensitive detection of H2O2.

No MeSH data available.