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Tunable growth of silver nanobelts on monolithic activated carbon with size-dependent plasmonic response.

Zhao H, Ning Y, Zhao B, Yin F, Du C, Wang F, Lai Y, Zheng J, Li S, Chen L - Sci Rep (2015)

Bottom Line: The widths of silver nanobelts are positively correlated to the growth temperatures.The width/thickness ratio of the silver nanobelts can be adjusted so that their transversal plasmonic absorption peaks can nearly span the whole visible light band, which endows them with different colours.This work demonstrates the great versatility of a simple, green and conceptually novel approach in controlled synthesis of noble metal nanostructures.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical Engineering, Jiangsu Marine Resources Development Research Institute, Huaihai Institute of Technology, Lianyungang 222005, P. R. China.

ABSTRACT
Silver is one of the most important materials in plasmonics. Tuning the size of various silver nanostructures has been actively pursued in the last decade. However, silver nanobelt, a typical one-dimensional silver nanostructure, has not been systematically studied as to tuning its size for controllable plasmonic response. Here we show that silver nanobelts, with mean width ranging from 45 to 105 nm and thickness at ca. 13 nm, can grow abundantly on monolithic activated carbon (MAC) through a galvanic-cell reaction mechanism. The widths of silver nanobelts are positively correlated to the growth temperatures. The width/thickness ratio of the silver nanobelts can be adjusted so that their transversal plasmonic absorption peaks can nearly span the whole visible light band, which endows them with different colours. This work demonstrates the great versatility of a simple, green and conceptually novel approach in controlled synthesis of noble metal nanostructures.

No MeSH data available.


Typical EM images of silver nanobelts prepared on MAC.(a) SEM. Scale bar, 1 μm. (b) TEM. Scale bar, 100 nm. (c) TEM (Scale bar, 100 nm) with corresponding ED pattern as the inset (Scale bar, 5 1/nm). (d) HRTEM. Scale bar, 5 nm.
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f1: Typical EM images of silver nanobelts prepared on MAC.(a) SEM. Scale bar, 1 μm. (b) TEM. Scale bar, 100 nm. (c) TEM (Scale bar, 100 nm) with corresponding ED pattern as the inset (Scale bar, 5 1/nm). (d) HRTEM. Scale bar, 5 nm.

Mentions: Figure 1 displays typical electron microscopic (EM) images of Ag nanobelts grown on MAC. The SEM image (Fig. 1a) shows that abundant wire-like products were obtained, with very few quasi-spherical particle impurities. Figure 1b is a typical TEM image of the Ag nanobelts. The mean width of the nanobelts shown in this image is ca. 45 nm. The thickness, as measured from a twisted nanobelt near the left side, is ca. 9 nm. This flat and smooth nanostructure lying on TEM grid is also confirmed by a Moire pattern at the right side, originated from the stacking of two or three nanobelts with different crystal orientation17. Figure 1c presents the TEM image of an individual nanobelt. Its selected area electron diffraction (SAED) pattern, as inserted in the upper right corner, has a six-fold symmetry. The d spacing of the planes corresponding to the brightest set of spots (squared) is calculated to be 0.144 nm, and the inner, weaker spots (circled) give a d spacing of 0.25 nm. This SAED pattern is identical to those reported previously18 and can be readily indexed to a single crystal fcc Ag in its zone axis. The two diffraction spots, squared and circled, can be attributed to {220} and 1/3{422} reflections, respectively. The appearance of the formally forbidden 1/3{422} reflection spots also indicates that the nanobelts have flat top and bottom {111} facets17. In Fig. 1d, the HRTEM image of a Ag nanobelt exhibits clear fringes parallel to the edge with a spacing of 0.25 nm, which is due to the 1/3{422} reflection. A spacing of 0.29 nm for the planes perpendicular to the edge can be associated with {110} reflection, indicating that the Ag nanobelt is oriented along [110] direction. This [110] primary growth direction is also in accordance with most previous studies171822. Occasionally, Ag nanobelt branches off into two stems at 60° (seeFig. 1b), and both are still along the <110> growth direction.


Tunable growth of silver nanobelts on monolithic activated carbon with size-dependent plasmonic response.

Zhao H, Ning Y, Zhao B, Yin F, Du C, Wang F, Lai Y, Zheng J, Li S, Chen L - Sci Rep (2015)

Typical EM images of silver nanobelts prepared on MAC.(a) SEM. Scale bar, 1 μm. (b) TEM. Scale bar, 100 nm. (c) TEM (Scale bar, 100 nm) with corresponding ED pattern as the inset (Scale bar, 5 1/nm). (d) HRTEM. Scale bar, 5 nm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4559802&req=5

f1: Typical EM images of silver nanobelts prepared on MAC.(a) SEM. Scale bar, 1 μm. (b) TEM. Scale bar, 100 nm. (c) TEM (Scale bar, 100 nm) with corresponding ED pattern as the inset (Scale bar, 5 1/nm). (d) HRTEM. Scale bar, 5 nm.
Mentions: Figure 1 displays typical electron microscopic (EM) images of Ag nanobelts grown on MAC. The SEM image (Fig. 1a) shows that abundant wire-like products were obtained, with very few quasi-spherical particle impurities. Figure 1b is a typical TEM image of the Ag nanobelts. The mean width of the nanobelts shown in this image is ca. 45 nm. The thickness, as measured from a twisted nanobelt near the left side, is ca. 9 nm. This flat and smooth nanostructure lying on TEM grid is also confirmed by a Moire pattern at the right side, originated from the stacking of two or three nanobelts with different crystal orientation17. Figure 1c presents the TEM image of an individual nanobelt. Its selected area electron diffraction (SAED) pattern, as inserted in the upper right corner, has a six-fold symmetry. The d spacing of the planes corresponding to the brightest set of spots (squared) is calculated to be 0.144 nm, and the inner, weaker spots (circled) give a d spacing of 0.25 nm. This SAED pattern is identical to those reported previously18 and can be readily indexed to a single crystal fcc Ag in its zone axis. The two diffraction spots, squared and circled, can be attributed to {220} and 1/3{422} reflections, respectively. The appearance of the formally forbidden 1/3{422} reflection spots also indicates that the nanobelts have flat top and bottom {111} facets17. In Fig. 1d, the HRTEM image of a Ag nanobelt exhibits clear fringes parallel to the edge with a spacing of 0.25 nm, which is due to the 1/3{422} reflection. A spacing of 0.29 nm for the planes perpendicular to the edge can be associated with {110} reflection, indicating that the Ag nanobelt is oriented along [110] direction. This [110] primary growth direction is also in accordance with most previous studies171822. Occasionally, Ag nanobelt branches off into two stems at 60° (seeFig. 1b), and both are still along the <110> growth direction.

Bottom Line: The widths of silver nanobelts are positively correlated to the growth temperatures.The width/thickness ratio of the silver nanobelts can be adjusted so that their transversal plasmonic absorption peaks can nearly span the whole visible light band, which endows them with different colours.This work demonstrates the great versatility of a simple, green and conceptually novel approach in controlled synthesis of noble metal nanostructures.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical Engineering, Jiangsu Marine Resources Development Research Institute, Huaihai Institute of Technology, Lianyungang 222005, P. R. China.

ABSTRACT
Silver is one of the most important materials in plasmonics. Tuning the size of various silver nanostructures has been actively pursued in the last decade. However, silver nanobelt, a typical one-dimensional silver nanostructure, has not been systematically studied as to tuning its size for controllable plasmonic response. Here we show that silver nanobelts, with mean width ranging from 45 to 105 nm and thickness at ca. 13 nm, can grow abundantly on monolithic activated carbon (MAC) through a galvanic-cell reaction mechanism. The widths of silver nanobelts are positively correlated to the growth temperatures. The width/thickness ratio of the silver nanobelts can be adjusted so that their transversal plasmonic absorption peaks can nearly span the whole visible light band, which endows them with different colours. This work demonstrates the great versatility of a simple, green and conceptually novel approach in controlled synthesis of noble metal nanostructures.

No MeSH data available.