pH-Controlled Hydrothermal Synthesis of Submicrometer-Sized CdS Spheres with Uniform Size Distribution

Effects of a Nonionic Surfactant on the pH-Controlled Hydrothermal Synthesis of CdS Sub-micrometer Particles

“…Our previous report revealed that simple reaction between two components, Cd 2+ and L-Cys, in a hydrothermal condition by adjusting solution pH to 12, can produce the CdS spheres with narrow size distribution. 10 That reaction is quite pH-sensitive and in order to attain narrow size distri- First, we synthesized the CdS under such a condition as reported before. 10 We mixed Cd 2+ and L-Cys (5 mM:50 mM) and adjusted the solution pH to 12 and transferred it to a hydrothermal reactor and heated in an oven (150 o…”

“…10 However, one shortcoming is that it requires rather long reaction time, namely 3 d, to achieve narrow size distribution, which hampered the practical use of the synthetic method. Therefore, we have been seeking for more facile methods that can shorten the reaction time of the above-mentioned synthetic method.…”

“…[1][2][3][4] In particular, many researcher has paid much attention to the synthesis and characterization of cadmium sulfide (CdS) nanostructures owing to their useful properties originating from the electronic structures and applications including photocatalysts, 5 light-emitting diodes, 6 and solar cells. CdS has been synthesized by such various methods as solidstate methods, 8 solvothermal methods, 9 hydrothermal methods, 10 and calcinations of Cd-thiolate complexes. 11 In the previous paper, we reported that spherical submicrometer-sized CdS could readily be synthesized from cadmium ion (Cd…”

“…Synthetic method is similar to that reported before except for adding PF127 as a surfactant. 10 Specifically, to prepare the reaction solution, aqueous solutions containing PF127 (MW = 12,500 Da) (1 mM, 1.26% (w/v)), Cd(NO 3 ) 2 (5 mM) and L-Cys (50 mM) were prepared in a vessel (150 mL) and vortexed for 10 min to ensure complete dissolution of the components. Then, NaOH (5 M) solution was added under constant magnetic stirring to adjust the pH of the solution from 3 to 12.…”

Synthesis of CdS Nanocrystals with Different Shapes via a Colloidal Method

“…For example, one-dimensional (1D) nanorods and nanowires have been observed to exhibit optical properties that are different from those of zero-dimensional (0D) quantum dots. [7][8][9][10][11][12] Therefore, systematic tuning of the crystal phase, size, and shape of semiconducting CdS NCs is important because it represents an attractive approach for developing next-generation, low-cost, and high-performance solar cells. A variety of methods have been devised to prepare 1D CdS NCs, such as template method, hot-injection route, polymer controlled growth, and liquid-phase colloidal syntheses.…”