کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8038349 | 1518338 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Breaking the Crowther limit: Combining depth-sectioning and tilt tomography for high-resolution, wide-field 3D reconstructions
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کلمات کلیدی
Aberration correction - اصلاح انحرافTem - این است3D imaging - تصویربرداری 3DTomography - توموگرافی، برشنگاریStem - ساقهDepth sectioning - عمق بخش بندیDepth of field - عمق میدانElectron microscopy - میکروسکوپ الکترونیscanning transmission electron microscopy - میکروسکوپ الکترونی انتقال اسکنNanoparticles - نانوذراتCatalysts - کاتالیزورها
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
To date, high-resolution (<1Â nm) imaging of extended objects in three-dimensions (3D) has not been possible. A restriction known as the Crowther criterion forces a tradeoff between object size and resolution for 3D reconstructions by tomography. Further, the sub-Angstrom resolution of aberration-corrected electron microscopes is accompanied by a greatly diminished depth of field, causing regions of larger specimens (>6Â nm) to appear blurred or missing. Here we demonstrate a three-dimensional imaging method that overcomes both these limits by combining through-focal depth sectioning and traditional tilt-series tomography to reconstruct extended objects, with high-resolution, in all three dimensions. The large convergence angle in aberration corrected instruments now becomes a benefit and not a hindrance to higher quality reconstructions. A through-focal reconstruction over a 390Â nm 3D carbon support containing over 100 dealloyed and nanoporous PtCu catalyst particles revealed with sub-nanometer detail the extensive and connected interior pore structure that is created by the dealloying instability.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultramicroscopy - Volume 140, May 2014, Pages 26-31
Journal: Ultramicroscopy - Volume 140, May 2014, Pages 26-31
نویسندگان
Robert Hovden, Peter Ercius, Yi Jiang, Deli Wang, Yingchao Yu, Héctor D. Abruña, Veit Elser, David A. Muller,