摘要:
利用0.97 GeV的
209Bi离子辐照二硫化钼(MoS
2)晶体,辐照注量范围为1×10
10~1×10
12 ions/cm
2,结合原子力显微镜(AFM)观测和Raman光谱分析研究了快重离子辐照对MoS
2热导率的影响。实验结果显示,快重离子辐照在MoS
2中产生了潜径迹,较高激光功率下的Raman测试使样品局部温度升高,导致
E1/2g和
A1g峰随注量增加向低波数方向移动,且峰形展宽。引入了通过改变激光功率测量Raman光谱得到MoS
2热导率的计算方法,获得了不同辐照注量下MoS
2的热导率的定量分析结果,随注量增加,热导率不断降低,从未辐照样品的563 W/mK下降到1×10
12 ions/cm
2辐照时的132 W/mK。
Molybdenum disulphide (MoS
2) was irradiated by 0.97 GeV
209Bi ions with the fluence of 1×10
10 to 1×10
12 ions/cm
2. The irradiation effect on the thermal conductivity of MoS
2 was analyzed by atomic force microscope (AFM) and Raman spectroscopy. The experimental results show that hillock-like latent tracks are observed on irradiated MoS
2 by AFM. The measurement of MoS
2 by Raman spectrometer with high laser power results in the increase of local temperature of MoS
2, which cause the downshift of peaks position and broadening of
E1/2g and
A1g peak. Furthermore, according to Raman spectra measured at different laser power, thermal conductivity of MoS
2 before and after irradiation was calculated, which show that the thermal conductivity of MoS
2 decreases with increasing fluence, from 563 to 132 W/mK for pristine and 1×10
12 ions/cm
2 irradiated MoS
2, respectively.