Hot-injection synthesis

Thiol stabilization also proved to offer a very successful route towards the creation of monosized nanoparticles of various compounds however, as it has also attracted widespread interest it will be outlined separately in Chapter 3.2.1.2. In this chapter, from this point onwards, attention will be focused on recent developments that differ from the hot injection synthesis and from the thiol technique. 

The hot injection method is one of the earliest synthetic methods for monodisperse nanocrystals and has been widely used for the synthesis of uniform nanocrystals of various materials (4, 14-16). In this section, we will discuss the kinetics of the synthesis of monodisperse CdSe nanocrystals via the hot injection method. 

Heat-up is a simple but effective method of synthesizing highly uniform nanocrystals, which yields a degree of size uniformity comparable to that of the best result from the hot injection method. This method is adopted mainly for the synthesis of metal oxide nanocrystals. In this section, we describe the synthetic procedure of iron oxide nanocrystals via the heat-up method as a representative example (23-25). 

Figure 3.114 Schematic representation of the hot injection technique usually employed in the organometallic synthesis of magnetic nanocrystals. A thermocouple (TC) controls the...

The solvothermal method is more efficient and permits wide range of reaction temperature due to high boiling point of the organic solvents. The most common method rmder solvothermal is hot-injection method compared to heating-up method used for colloidal synthesis of nanocrystals. 

Zou et al. have reported the synthesis of CZTS nanoerystals by a hot injection method. " ZnS impurities were detected by UV-Vis and Raman spectroscopy measurements when reaction was carried out with a Zn/Sn precursor ratio of 1.2. The mechanism for formation of CZTS and ZnS impurities was also investigated. It was found that formation of crystalline CZTS and Cu2SnS3 and amorphous ZnS were formed after injection of sulfur-oleylamine into the mixture solution. Reaction of ZnS with... 

The thermal decomposition of organometalhc precursors is probably the most important method for the synthesis of colloidal, inorganic nanocrystals in general (this method is sometimes called hot injection method ). Typically, a solution of... 

Many problems arise during the synthesis of NIR QDs. Take the hot injection method, for example. Although the synthesis looks extremely simple and is used for the majority of the hot injection method is... 

Donega CM, Liljeroth P, Vanmaekelbergh D (2005) Physicochemical evaluation of the hot-injection method, a synthesis route for monodisperse nanocrystals. Small 1 1152... 

Korgel and co-workers reported the colloidal synthesis of the related Cu2-xSe nanocrystals by the hot-injection of selenourea to CuCl, both dissolved in OAm and heated to 240 °C. As-obtained NCs were predominantly spherical with average size of ca. 16nm (Fig. 6(b)). The hydrophobic OAm ligands on the surface were substituted by an amphiphilic polymer so that the... 

Xie et al. also reported the synthesis of Cd3P2 QDs by a similar hot injection of [(TMSjsP] in ODE to a mixture of CdO and OA in ODE at 230 °C. The reaction temperature was raised to 250 °C, maintained for 1 minute and cooled to room temperature. XRD analysis showed tetragonal Cd3P2 phase and electron microscopy analysis of the product showed a wide... 

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