Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 19, Pages 17637-17646Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b02052
Keywords
silver nanoparticles; size control; SERS; uniformity; reproducibility
Funding
- National Natural Science Foundation of China [21773142, 21473105]
- Taishan Scholarship in Shandong Provinces [tsqn20161001]
- Fundamental Research Funds of Shandong University [2016JC003]
- Shandong Provincial Natural Science Foundation for Distinguished Young Scientists [JQ201405]
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In this work, we reported the synthesis of monodisperse, quasispherical Ag nanoparticles (NPs) with sizes of 40-300 nm by using ascorbic acid reduction of a silver-ammonia complex onto preformed, 23 nm Ag-NP seeds in the aqueous solution with an optimal pH of about 9.6 at room temperature. The as-prepared Ag NPs with such a large size span (from 40 to 300 nm) and high quality by one-pot seeded growth method are reported for the first time to the best of our knowledge. It is found that the key in the present seed-mediated growth method is to introduce a proper amount of ammonia water for the formation of a stable complex with a silver precursor (silver-ammonia complex) while maintaining the pH value of the growth solution simultaneously. By using rhodamine 6G molecules as probes, the surface-enhanced Raman scattering (SERS) activities of the as-prepared Ag NPs in ethanol solution are highly dependent on the sizes of Ag NPs at the fixed 633 nm laser and at the fixed particle number, which show a volcano-like curve. Moreover, 125 nm Ag NPs bear the largest SERS activity among them. Furthermore, Ag NPs with narrow distributions in shape and size (say, less than 10%) can achieve the uniformity and reproducibility of their SERS signals in solution; their relative standard deviations can be as low as 5% in space and temporal scale.
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