Abstract

In this work, we present a study conducted on oxygen adsorptions and desorptions carried out on zinc oxide layers. The objective is to regenerate the ZnO layer surface and to determine the orders of magnitude of the interaction energies between oxygen and the superficial states of this material, thus to show the constants of the adsorption kinetics. We have used the model of Th. Wolkenstein, which calculates the thermal desorption energy W_des and the model of J.C. Lethiesse and R. Lalauze, which make it possible to calculate the constants of the kinetics of adsorption. The desorption signature shows peaks at temperatures T_m where some adsorbed states desorb. The values of W_des found are of the order of 0.19 to 0.51 eV. The theoretical curves adjust, shows the constants of the adsorption kinetics for three peaks of the signature. The constants of adsorption kinetics at T_a = 19°C are: For the first peak (T_m = 172°C) a = 10, a' = 7 and b = 4, b' = 0.7 . For the second peak (T_m = 140°C) a = 29, a' = 0.9 and b = 12, b' = 0.3. For the third peak (T_m = 66°C) a = 1.45, a' = 3.2 and b = 1.7, b' = 0.00009.

中文翻译：

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O 2化学吸附后ZnO的表面再生– T a = 19°C时的解吸能和吸附动力学常数的测定

摘要

在这项工作中，我们提出了一项关于在氧化锌层上进行氧吸附和解吸的研究。目的是再生ZnO层表面并确定氧与该材料的表面状态之间相互作用能的数量级，从而显示出吸附动力学的常数。我们使用了Th模型。Wolkenstein，其计算热脱附能W _des，以及JC Lethiesse和R.Lalauze的模型，从而可以计算出吸附动力学常数。解吸特征显示出在温度T _m处的一些吸附态解吸的峰。W _des的值发现的量级为0.19至0.51eV。调整理论曲线，显示出三个特征峰的吸附动力学常数。在T _a＝ 19℃下的吸附动力学常数为：对于第一个峰（T _m＝ 172℃），a＝ 10，a ′＝ 7，b＝ 4，b ′＝ 0.7。对于第二个峰（T _m＝ 140℃），a＝ 29，a ′＝ 0.9，b＝ 12，b ′＝ 0.3。对于第三个峰（T _m = 66°C）a = 1.45，a '= 3.2和b= 1.7，b '= 0.00009。