High‐resolution backscatter electron imaging of colloidal gold in LVSEM

High‐resolution backscatter electron imaging of colloidal gold in LVSEM
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LVSEM 中胶体金的高分辨率背散射电子成像

DOI:
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发表时间:
2003
影响因子:
2
通讯作者:
Carol L. Wells
Carol L. Wells
中科院分区:
工程技术4区
文献类型:
--
作者:
S. Erlandsen;Yuqing Chen;C. Frethem;J. Detry;Carol L. Wells

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胶体金的高分辨率背散射电子(BSE)成像可以在低电压下使用透镜内或透镜下的FESEM来完成,FESEM配备有掺杂铈的Autrata改性钇铝石榴石(YAG)晶体,或BSE到二次电子(SE)转换板。YAG探测器检测胶体金的BSE阈值为1.8 keV,BSE/SE转换灵敏度低至1 keV。金颗粒(6,12和18 nm)的原子序数为79,并在500 000×材料对比度下清楚区分,很容易与原子序数为78的铂涂层细胞表面区分开来。BSE成像对充电相对不敏感,并且样品上的碳污染物的积累对较高能量的BSE是透明的。
High‐resolution backscatter electron (BSE) imaging of colloidal gold can be accomplished at low voltage using in‐lens or below‐the‐lens FESEMs equipped with either Autrata‐modified yttrium aluminium garnet (YAG) scintillators doped with cerium, or with BSE to secondary electron (SE) conversion plates. The threshold for BSE detection of colloidal gold was 1.8 keV for the YAG detector, and the BSE/SE conversion was sensitive down to 1 keV. Gold particles (6, 12 and 18 nm) have an atomic number of 79 and were clearly distinguished at 500 000× by materials contrast and easily discriminated from cell surfaces coated with platinum with an atomic number of 78. BSE imaging was relatively insensitive to charging, and build up of carbon contamination on the specimen was transparent to the higher energy BSE.
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DOI: --
发表时间: 1989
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影响因子: --
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