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[求助]HRTEM與TEM制樣有何區(qū)別?
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請(qǐng)教各位高手:HRTEM與TEM制樣有何區(qū)別?我的樣品是碳化硼陶瓷,很脆。 我以前做過(guò)幾個(gè)TEM,現(xiàn)在想做HRTEM,不知它們制樣有何區(qū)別?做過(guò)TEM實(shí)驗(yàn)的樣品還可以繼續(xù)做HRTEM嗎? 一直聯(lián)系不到做HRTEM的合適的地方,剛好一師兄要出國(guó),托他帶過(guò)去做,(那邊是醫(yī)學(xué)用的高分辨透鏡,3000伏安的)。師兄搞的課題不是材料方面的,除了物質(zhì)的基本參數(shù)和TEM圖片外,不知我還要準(zhǔn)備那些相關(guān)的資料等? 謝謝各位了! |
金蟲(chóng) (著名寫(xiě)手)
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HRTEM-h(huán)igh resolution TEM, 高分辨透射電子顯微鏡 以我做實(shí)驗(yàn)的經(jīng)驗(yàn),兩者的原理是同樣的。 HRTEM精度更高,它的電壓20 KV,30KV,遠(yuǎn)高于低倍TEM。同樣,作HRTEM的時(shí)候,對(duì)樣品的制備要求也高,一般要求在TEM下掃描樣品后,才可以作HRTEM的,因?yàn)榕卤砻娴挠袡C(jī)物污染到儀器的一些精密元件。 呵呵 說(shuō)白了,幾乎是一樣的,就像一個(gè)是低倍照相機(jī),一個(gè)是高倍照相機(jī) 不過(guò)要注意區(qū)別 |

木蟲(chóng) (小有名氣)

專(zhuān)家顧問(wèn) (著名寫(xiě)手)
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專(zhuān)家經(jīng)驗(yàn): +41 |

銅蟲(chóng) (小有名氣)
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High Resolution Transmission Electron Microscopy (HRTEM) is an imaging mode of the transmission electron microscope (TEM) that allows the imaging of the crystallographic structure of a sample at an atomic scale. Because of its high resolution, it is an invaluable tool to study nanoscale properties of crystalline material such as semiconductors and metals. At present, the highest resolution realised is 0.8 Å with microscopes such as the OAM at NCEM. Ongoing research and development such as efforts in the framework of TEAM will soon push the resolution of HRTEM to 0.5 Å. At these small scales, individual atoms and crystalline defects can be imaged. One of the difficulties with HRTEM is that image formation relies on phase-contrast. In phase-contrast imaging, contrast is not intuitively interpretable as the image is influenced by strong aberrations of the imaging lenses in the microscope. |
銅蟲(chóng) (小有名氣)
木蟲(chóng) (小有名氣)
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