common methods, such as hydrothermal method, solvothermal method, wet chemical method. Besides, the metalorganic coordination polymers (MOCPs) have been thought as effective templates to obtain the desired nanomaterials in the recent studies. By choosing appropriate MOCP precursors with special morphologies and under suitable experimental conditions, we can obtain the desired morphologies and even the nano-compounds that can be obtained by other methods [3,4]. Among the various divalent metal hydroxides, cadmium hydroxide [Cd(OH) 2 ] is a wide band gap semiconductor with a wide range of possible applications, including solar cells, phototransistors and diodes, transparent electrodes, and sensors, and consequently [5][6][7]. Furthermore, Cd(OH) 2 is an important precursor to prepare cadmium oxide (CdO) [8-11] by high-temperature calcination or for other functional materials such as cadmium sulfide (CdS) [12,13] and cadmium selenide (CdSe) [14-17] by reaction with appropriate compounds, which can be used as electrode additives to increase the discharge capacity of Cd-Ni batteries or pseudocapacitor and reduce self-discharge [18][19][20][21][22]. Numerous techniques have been proposed to synthesize various Cd(OH) 2 nanostructures with promising control of properties. And their potential applications and future prospects have also been discussed.
Synthesis of Cd(OH) 2 nanomaterials Hydrothermal synthesisAs a common and an effective method to synthesize functional nanomaterials, hydrothermal synthesis method has the advantage of high yield, less pollution, and being easy to operate. And products with good crystallization and various morphologies can be prepared via hydrothermal Abstract Recently, Cd(OH) 2 nanomaterials have attracted attention because of their distinct properties. Cd(OH) 2 nanostructures with different morphologies have been successfully synthesized and used in various fields. In this paper, the preparation of Cd(OH) 2 nanomaterials is reviewed including hydrothermal, solvothermal, wet chemical, refluxing, microwave-assisted methods, and their applications are briefly introduced in hydrophobic and hydrophilic materials, adsorption of negative organic molecules, sensors, and electrode materials. The development trend and prospects of the preparation of nano Cd(OH) 2 are proposed.