Chinese Journal of Applied Chemistry ›› 2016, Vol. 33 ›› Issue (10): 1196-1202.DOI: 10.11944/j.issn.1000-0518.2016.10.160159

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In-situ Growth Mechanism and Thermodynamic Functions of ZnO Nanosheet Structures

TANG Huanfenga,HUANG Zaiyinab*(),LIU Zuojiaoa   

  1. aCollege of Chemistry and Chemical Engineering
    bKey Laboratory of Forest Chemistry and Engineering,Guangxi University for Nationalities,Nanning 530006,China
  • Received:2016-04-14 Accepted:2016-06-27 Published:2016-10-08 Online:2016-10-08
  • Contact: HUANG Zaiyin
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21273050, No.21573048)

Abstract:

Three different sizes of ZnO nanosheet structures were prepared in one step by using the green water reaction system at room temperature. Microcalorimetry was used to obtain the in-situ growth heat curves, whose thermodynamic information of growth can be recorded in-situ and the corresponding growth mechanism was discussed from the point of thermodynamics. In addition, the electromotive forces were performed by a primary battery assembled by applying the prepared nano-ZnO and purchased bulk ZnO onto the surface of two zinc electrodes under different temperatures. The thermodynamic functions of nano-ZnO were gained by combining with basic formula of thermodynamic and associated with the growth mechanism. The results reveal that the growth of the ZnO nanosheet structures undergoes three stages for heat change. The standard molar entropy, standard molar Gibbs free energy, and standard molar enthalpy are increased along with the decreasing particle size. This paper provides a new method for investigating the in-situ growth mechanism and the thermodynamic functions of nanomaterials.

Key words: nano-ZnO, microcalorimetry, in-situ growth, thermodynamic functions, electrochemical method