采用水热法, 以3mol/L NaOH作为矿化剂, 在260℃下, 保温28h进行Cr合金化(x=0.10, 0.15, 0.20, 0.25), 合成Zn1-xCrxO稀磁半导体晶体. 研究了Cr合金化对水热合成Zn1-xCrxO稀磁半导体粉体结构和性能的影响. XRD测试表明, Cr元素进入到ZnO的晶格内, 实现了Cr的合金化, 晶粒尺寸分别为46.5、46.1、50.6和48.9nm. 从FE-SEM可以观察到, x>0.2时, 晶体的形貌从短柱状转变为长柱状. 通过UV/Vis测试可以观察到Cr离子的吸收, ZnO的禁带宽度依次降低为3.17、3.18、3.19和3.23eV. VSM测试表明, 所制备的Zn1-xCrxO纳米晶体在室温下均表现出弱顺磁性.
Zn1-xCrxO diluted magnetic semiconductors were synthesized by hydrothermal method at 260℃ for about 28h with different concentrations of Cr (x=0.1, 0.15, 0.2 and 0.25), NaOH with concentration of 3mol/L were used as the mineralizer. X-ray diffraction patterns indicate
that as-prepared Cr-alloyed ZnO has the wurtzite structure with Zn2+ partially substituted by Cr3+ , and the average crystallite size of Zn1-xCrxO are 46.5, 46.1, 50.6 and 48.9nm, respectively. FE-SEM analyses show that the structure of nanopowders changes from short stylolitic structure to long stylolitic structrue when Cr concentration x increases to 0.2. The absorption peaks of Cr-doped nanopowders are demonstrated by UV-Vis analysis, and E_g of ZnO are 3.17, 3.18, 3.19 and 3.23eV, respectively. Room temperature VSM reveals a weakly paramagnetism behavior of the as-prepared Zn1-xCrxO nanocrystalline.
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