橢偏儀在位表征電化學(xué)沉積的系統(tǒng)搭建（十六）- 可行性分析

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橢偏儀在位表征電化學(xué)沉積的系統(tǒng)搭建（十六）- 可行性分析

3.2.4可行性分析

(1)光路可行性分析

如圖3-4所示蛤售，為了保證對電極不影響光路的傳輸，其可活動的范圍為圖中h所示妒潭。如果半圓直徑為50px悍抑，對電極寬25px，上限由電極碰到池體壁決定杜耙，則此時入射光的極限入射角為?₁=30°搜骡；下限由入射光的入射角決定，圖中的入射角?₂=55°佑女，則電極可調(diào)的極限zui低位置如圖所示记靡。所以在滿足對電極不擋光的情況下，入射光的入射角可調(diào)范圍是30°

圖3-4觀察窗口光路截面分析圖

用鍍金硅片和電解液(透明溶液)在玻璃皿中調(diào)節(jié)了準(zhǔn)直紊选，不經(jīng)過玻璃皿啼止，溶液中鍍金硅片可以很好的反光；后又把玻璃皿的蓋子蓋上兵罢，驗證得知献烦，在垂直于玻璃蓋、空氣卖词、溶液界面入射時巩那，光斑可以很好的打到電極片上，基本不受光路影響，斜射時光斑就散了即横。經(jīng)過實際驗證噪生，該池體設(shè)計方案可行。

關(guān)于調(diào)節(jié)光斑使其達(dá)到圓心东囚，這也可以實現(xiàn)的杠园，因為一旦不是垂直于池體入射，光斑就是分散的舔庶。

(2)電極的選擇

如圖3-5抛蚁，用Comsol對如圖放置的長正方形電極和圓電極進行了陽極電流密度的模擬結(jié)果如圖3-6示。

圖3-5電極電流密度模擬圖

從圖3-6中可以看出邊緣效應(yīng)隨著電極的增大而減小惕橙，考慮到電解池尺寸瞧甩，則選則25px×25px的電極片是比較合適的。從c弥鹦、d對比可知肚逸，圓盤電極的邊緣化效應(yīng)比長方形電極邊緣化效應(yīng)更嚴(yán)重，所以選片電極更合適彬坏。

圖3-6不同尺寸電極無量綱電流密度模擬圖(a)6.25px×6.25px朦促；(b)12.5px×12.5px；(c)25px×25px栓始；(d)半徑為12.5px的圓盤電極

3.2.5池體制作

現(xiàn)已經(jīng)完成了制作务冕，如圖3-7所示。池體兩端的長方體及電極載體是亞克力板制作幻赚，中間的半圓柱體由石英玻璃制作禀忆，以上部件定制完成，后期拼接自主完成落恼。

圖3-7電解池實物圖

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