吴友朋
,
刘祥萱
,
周友杰
,
莫斌
,
吴春
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2010.01.011
对最佳的吸收剂颗粒粒度进行数值计算和分析.从趋肤效应和单个磁畴颗粒大小两个角度,以纯铁粉为例对最佳的粒度做了分析,结果表明,对于2～18 GHz的雷达波,铁粉颗粒在16 nm～1μm为好.还分析了利用纳米颗粒的量子尺寸效应来吸收电磁波时颗粒的尺寸范围,计算结果表明,此时颗粒尺寸至少应小于22 nm.
关键词:
吸波材料
,
颗粒尺寸
,
趋肤效应
,
单磁畴
,
量子尺寸效应
C.Bouvy
,
B.L.Su
材料科学技术（英）
Optoelectronic nanocomposites are a new class of materials, which exhibit very interesting and particular properties and attract a growing attention due to their potential applications in information storage and optoelectronic devices. Zinc oxide, ZnO, is one of the most interesting binary semiconductor (3.37 eV) with very important optical properties, which can be used in the fields such as short wavelength lasers, blue light emitting diodes, UV detectors, gas sensors, etc. This paper reviews the very recent progress in the preparation of silica-based ZnO nanocomposites. After an introduction reviewing the theoretical background, the article will begin with a survey of the optical properties and the quantum size effect (QSE) of ZnO/SiO2 nanocomposites prepared by the inclusion of ZnO nanoclusters inside silica mesoporous materials. The second part will focus on one of the most interesting properties of ZnO/SiO2 nanocomposites, which is the random lasing effect after one- and two-photon excitation. The final part will deal with the introduction of ZnO nanoparticles inside microporous zeolites and the observation of QSE. For comparison, the photoluminescence (PL) and QSE properties of ZnS nanoparticles occluded in mesoporous media are also described. New potential applications will be discussed since short-wavelength devices are required by industry to design, for instance, new information storage supports and biolabelling devices.
关键词:
ZnO nanoparticles
,
nanoparticles
,
microporous
,
and
,
mesopo
