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yuan0806

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[×ÊÔ´] ÄÉÃ×´óÅ£ÏÄÓ×ÄÏJACSÐÂ×÷¡ª¡ª10 nmÒøÁ¢·½µÄºÏ³ÉÒÔ¼°·Ç¾ùÏà³ÉºË»úÀí

ÄÉÃ×´óÅ£ÏÄÓ×ÄϵÄÐÂ×÷(¸ÕÔÚÏß·¢±í)£¬ÎÄÕ½éÉÜÁËÄÉÃ×ÒøÁ¢·½µÄ·Ç¾ùÏà³ÉºË»úÀíÒÔ¼° SH−ÔÚµ÷¿ØÄÉÃ×ÒøÁ¢·½Éú³¤µÄ×÷Óᣡ£¡£ÑóÑóÈ÷È÷ÒýÓÃ49ƪÎÄÏ×
±êÌ⣺Toward the Synthesis of 10-nm Ag Nanocubes with Sharp Corners and Edges: The Roles of Heterogeneous Nucleation and Surface Capping
×÷ÕߣºAleksey Ruditskiy and Younan Xia
ÆÚ¿¯£ºJ. Am. Chem. Soc., (IF=12.113)
Just Accepted Manuscript
DOI: 10.1021/jacs.5b13163
ÎÄÕÂÁ´½Ó£ºhttp://pubs.acs.org/doi/abs/10.1021/jacs.5b13163
Publication Date (Web): February 15, 2016

We report a polyol method for the facile synthesis of Ag nanocubes having sharp corners
and edges, together with edge lengths below 15 nm. The rapid nucleation of Ag atoms was
facilitated through the addition of a trace amount of SH− to generate Ag2S clusters while the
corners and edges of the nanocubes were sharpened through the introduction of Br− as a
regulator of the growth kinetics and a capping agent for the Ag(100) surface. Because of their
much smaller size relative to the more commonly used capping agent based on poly(vinyl
pyrrolidone), Br− ions are more effective in passivating the {100} facets on very small Ag
nanocubes. The mechanistic roles of these additives, along with the effects of their interactions
with other species present in the reaction solution, were all systematically investigated. The
concentration of SH− was found to be a particularly effective parameter for tuning the edge
length of the nanocubes. As a result of the understanding gained during the course of this study,
Ag nanocubes with uniform edge lengths controllable in the range of 13-23 nm could be reliably
produced. The nanocubes of 13.4¡À0.4 nm in edge length constitute the smallest nanocrystals of
this kind reported to date; they also possess sharper corners and edges relative to the limited
examples of sub-20 nm Ag nanocubes reported in the literature. The availability of such small
and sharp Ag nanocubes will open the door to an array of applications in plasmonics, catalysis,
and biomedicine.ÄÉÃ×´óÅ£ÏÄÓ×ÄÏJACSÐÂ×÷¡ª¡ª10 nmÒøÁ¢·½µÄºÏ³ÉÒÔ¼°·Ç¾ùÏà³ÉºË»úÀí
Schematic illustration showing the formation of Ag nanocubes through heterogeneous nucleation.png

[ Last edited by yuan0806 on 2016-2-24 at 13:04 ]
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  • 2016-02-22 09:28:38, 3.95 M

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