JAIST Repository: Charge-transfer-induced suppression of galvanic replacement and synthesis of (Au@Ag)@Au double shell nanoparticles for highly uniform, robust and sensitive bioprobes
2
0
0
全文
(2) Charge-transfer-induced suppression of galvanic replacement and synthesis of (Au@Ag)@Au double shell nanoparticles for highly uniform, robust and sensitive bioprobes Name: Dao Thi Ngoc Anh Student ID: s0930204 Maenosono Laboratory. Abstract In the field of sensing and diagnostics, Ag@Au core-shell nanoparticles (NPs) have become intriguing biological probes because of the beneficial coupling of the two metals. The Ag core provides high enhanced-Raman activity, while the Au shell provides excellent chemical stability and a great reactivity with sulfur containing biomolecules. Aqueous synthesis techniques for Ag NPs are advantageous for biological applications because the resulting NPs can often be used directly, yet these techniques typically provide unstable Ag NPs of low monodispersity, or with a size that is difficult to control. In addition, it is still challenging to synthesize well-defined uniform Ag@Au NPs because the Ag core is easily etched away due to the galvanic replacement reaction between Au ions and the Ag metal cores which causes gaps in the Au shell or hollow sections at the interface of the core and the shell. In this research, we successfully synthesize double shell (Au@Ag)@Au NPs without any defects or gaps in the structure. The synthesis is accomplished through suppression of the galvanic replacement reaction caused by an electron transfer phenomenon. The resulting NPs are monodisperse with a thin and uniform second Au shell. In addition, (Au@Ag)@Au double shell NPs have resistance to oxidation, high stability in the presence of salt, also give strong surface-enhanced Raman scattering (SERS) intensity, and therefore are ultimately expected to lead to novel probes for biomolecular sensing and diagnostics.. Keywords: Core-shell nanoparticle, Gold, Silver, Galvanic replacement, Electron transfer..
(3)
関連したドキュメント
Based on the asymptotic expressions of the fundamental solutions of 1.1 and the asymptotic formulas for eigenvalues of the boundary-value problem 1.1, 1.2 up to order Os −5 ,
Therein, they analyzed these numbers mainly from the perspective of alge- braic operads, but also provided the following combinatorial description in terms of subdivid- ing
Shen, “A note on the existence and uniqueness of mild solutions to neutral stochastic partial functional differential equations with non-Lipschitz coefficients,” Computers
The Main Theorem is proved with the help of Siu’s lemma in Section 7, in a more general form using plurisubharmonic functions (which also appear in Siu’s work).. In Section 8, we
In this case (X t ) t≥0 is in fact a continuous (F t X,∞ ) t≥0 -semimartingale, where the martingale component is a Wiener process and the bounded variation component is an
Here ∂D 1 is locally uniformly rectifiable and D 1 is constructed by removing from D certain balls on which |∇ u | is “small.” With this intuition we finally were able to make
Here we shall supply proofs for the estimates of some relevant arithmetic functions that are well-known in the number field case but not necessarily so in our function field case..
Where a rate range is specified, the higher rates should be used (a) in fields with a history of severe weed pressure, (b) when the time between early preplant tank mix and
