Preparation of monodisperse Se colloid spheres and Se nanowires using Na2SeSO3 as precursor

Abstract

Nearly monodisperse spherical amorphous Se colloids are prepared by the dismutation of Na 2 SeSO 3 solution at room temperature; by altering the pH of the solution, amorphous Se colloid spheres with sizes of about 120 nm, 200 nm, 300 nm, and 1 μm can be obtained. Se@Ag 2 Se core/shell spheres are successfully synthesized by using the obtained amorphous Se (a-Se) spheres as templates, indicating the potential applications of these Se nanomaterials in serving as soft templates for other selenides. Meanwhile, selenium nanowires are obtained through a "solid-solution-solid" growth process by dispersing the prepared Se spheres in ethanol. This simple and environmentally benign approach may offer more opportunities in the synthesis and applications of nanocrystal materials.

Biomimetic synthesis of selenium nanoparticles by Pseudomonas aeruginosa ATCC 27853: An approach for conversion of selenite

“…The prominent peak at 254 cm À1 could be attributed to amorphous selenium as a consequence of irregularly, arrayed selenium atoms as disordered chains (Li et al, 2010;Van Overschelde et al, 2013). While, the less intense peak at 234 cm À1 corresponds to trigonal selenium which was formed due to phase transformation of amorphous selenium to trigonal selenium by powerful Raman laser beam during measurement (Liu et al, 2008). Thus, the data further supports results obtained from the XRD on the synthesis of amorphous selenium nanoparticles by P. aeruginosa.…”

Bacillus cereus, selenite-reducing bacterium from contaminated lake of an industrial area: a renewable nanofactory for the synthesis of selenium nanoparticles

“…The spectrum showed two characteristic resonance peaks at 234 and 254 cm −1 , which could be attributed to amorphous (Van Overschelde et al 2013) and trigonal selenium (Liu et al 2008), respectively. The trigonal selenium could have formed via phase transformation of amorphous selenium to trigonal selenium by powerful Raman laser beam during measurement (Liu et al 2008). Besides, the broadened Raman bands also explain the nanosize effect of the produced nanoparticles (Shikuo et al 2007).…”

Synthesis of selenium nanorods with assistance of biomolecule

“…Recently, onedimensional (1D) Se nanostructures are widely used in biosensor and solar cells (Zhang et al 2004(Zhang et al , 2006c and Sebased semiconducting nanorods are also preferentially used in photovoltaic devices due to their huge interface, nonflat morphology and band transport (Kislyuk and Dimitriev 2008). Many researchers have synthesized 1D Se nanostructure via reduction process using various selenium sources such as H 2 SeO 3 , Na 2 SeO 3 , Na 2 SeSO 3 and bulk Se powder with different reducing agents such as N 2 H 4 and NaCH 2 O by hydrothermal (Zhang et al 2006a,b,c), solvothermal (Huang and Qi 2009), solid-solution-solid (Liu et al 2008;Zhu et al 2006), electrodeposition (Zhang et al 2006c), refluxing (Shah et al 2007) and sonochemical method (Ma et al 2004).…”

“…To avoid the use of toxic reducing agents, some researchers have used biomolecule substances such as oleic acid, β-cyclodextrin and cytochrome C 3 as stabilizers and ascorbic acid as reducing agent for synthesis of Se nanostructures (Abdelouas et al 2000;Li and Yam 2006;Liu et al 2008). Moreover, β-carotene, polyvinyl alcohol and glucose were also used in dual role as reducers and structural directing agents (Zhang et al 2006a,b,c;Shah et al 2007;Chen et al 2010).…”