Hor ManuscriptAcknowledgmentsThis operate was supported by the National Institutes of Wellness (RANTES/CCL5 Protein MedChemExpress R01CA160417 to D.T.).
Zhou et al. Nanoscale Analysis Letters 2014, 9:302 nanoscalereslett/content/9/1/NANO EXPRESSOpen AccessMorphology and composition controlled synthesis of flower-like silver nanostructuresNing Zhou1,2, Dongsheng Li1,two and Deren YangAbstractFlower-like silver nanostructures with controlled morphology and composition have been ready by means of wet-chemical synthesis. The reaction rate is merely manipulated by the quantity of catalyzing agent ammonia added that is the crucial point to identify the ratio of hexagonal close-packed (HCP) to face-centered cubic (FCC) phase in silver nanostructures. The existence of formic acid that is the oxidation product of aldehyde group is demonstrated to play a important role in achieving the metastable HCP crystal structures by replacing ionic surfactants with polyvinylpyrrolidone (PVP). Utilizing flower-like silver nanostructures as surface-enhanced Raman scattering (SERS) substrates, Raman signal of Rhodamine 6G, or 4-aminothiophenol with concentration as low as 10-7 M was detected. Furthermore, it really is demonstrated that phase composition has no direct relation to the SERS enhancing issue which is mostly determined by the level of hot spots. Key phrases: Flower-like; Silver nanostructure; Hexagonal close-packed; Overgrowth; SERSBackground In the final decades, it has been demonstrated that metallic nanostructures are a potent indicates to attain the subwavelength manage of electromagnetic field due to the so-called surface plasmon (SP) effect supported by them [1,2]. Confining the oscillating collective excitations at the interface of a metal in addition to a dielectric introduces the prospect of optical devices with new functionalities by enhancing inherently weak physical processes, which include fluorescence [3] and Raman scattering which the latter is nominally referred to as surface-enhanced Raman scattering (SERS) [4]. Surface plasmon and electrooptical properties is often correctly and intentionally regulated by the size and shape in the nanostructure. Several morphology-controlled noble metal structures happen to be synthesized amongst which flower-like silver nanostructures raise a lot focus and are promising candidates as SERS substrate owing to silver-intrinsic outstanding properties than other metals [5], the existence of abundance of `hot spots’ in sharp suggestions and nanoparticle junctions resembling intuitively nanoscale optical antenna [6,7]. Correspondence: [email protected] 1 State Important Laboratory of Silicon Supplies and Division of Supplies Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China two Cyrus Tang Center for Sensor Supplies and Applications, Zhejiang University, Hangzhou 310027, People’s Republic of ChinaNowadays, quite a few approaches like chemical reduction [8,9], light HSP70/HSPA1A Protein site irradiation [7], galvanic replacement [10], evaporation [11], and anisotropic etching [12] have already been created to prepare flower-like noble metal nanostructures. Metal nanostructures with well-controlled shape, size, and uniquely developed optical properties might be finely ready with multistep procedures which include double-reductant approach, etching method, and building of core-shell nanostructures [13]. In comparison, while single-step reduction demands to become regulated carefully and improved intentionally, this process might be a lot more efficient. Within the solution-phase synthesis, nanocrystals of widespread face-cent.
