Hor ManuscriptAcknowledgmentsThis function was supported by the National Institutes of Wellness (R01CA160417 to D.T.).Zhou et

Hor ManuscriptAcknowledgmentsThis function was supported by the National Institutes of Wellness (R01CA160417 to D.T.).
Zhou et al. Nanoscale Investigation Letters 2014, 9:302 nanoscalereslett/content/9/1/NANO EXPRESSOpen AccessMorphology and composition controlled synthesis of flower-like silver nanostructuresNing Zhou1,two, Dongsheng Li1,2 and Deren YangAbstractFlower-like silver nanostructures with controlled morphology and composition had been prepared by way of wet-chemical synthesis. The reaction price is just manipulated by the level of catalyzing agent ammonia added which is the important point to determine the ratio of hexagonal close-packed (HCP) to face-centered cubic (FCC) phase in silver nanostructures. The existence of formic acid that is certainly the oxidation item of aldehyde group is demonstrated to play a vital function in reaching 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 truly is demonstrated that phase composition has no direct relation for the SERS enhancing aspect that is mostly determined by the level of hot spots. Search phrases: Flower-like; Silver nanostructure; Hexagonal close-packed; Overgrowth; SERSBackground Within the final decades, it has been demonstrated that metallic nanostructures are a effective means to attain the subwavelength control of electromagnetic field because of the so-called surface plasmon (SP) effect supported by them [1,2]. Confining the oscillating collective excitations in the interface of a metal and also a dielectric introduces the prospect of optical devices with new functionalities by enhancing inherently weak physical processes, for example fluorescence [3] and Raman scattering which the latter is nominally named surface-enhanced Raman scattering (SERS) [4]. Surface plasmon and electrooptical properties is usually properly and intentionally regulated by the size and shape on the nanostructure. Different morphology-controlled noble metal structures happen to be synthesized amongst which flower-like silver nanostructures raise much interest 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 strategies and nanoparticle junctions resembling intuitively nanoscale optical antenna [6,7]. Correspondence: [email protected] 1 State Key Laboratory of Silicon μ Opioid Receptor/MOR Modulator Formulation Components and Department 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, a lot of approaches such as chemical reduction [8,9], light 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 designed optical properties is usually finely prepared with multistep MMP-3 Inhibitor Source techniques such as double-reductant approach, etching approach, and building of core-shell nanostructures [13]. In comparison, although single-step reduction needs to be regulated meticulously and improved intentionally, this method may be extra efficient. Within the solution-phase synthesis, nanocrystals of widespread face-cent.