本實驗使用原子轉移自由基聚合法（Atom transfer radical polymerization, ATRP）於圖案化矽晶圓表面進行表面起始聚合（Surface-initiated polymerization）製備出聚(甲基丙烯酸)( PMAA)高分子刷。使得奈米鐵粒子固定於高分子刷製備出具有磁場感應光柵。
結果顯示可在線/間距比率為1:1.5的圖案化光阻晶圓表面長出線寬為1、1.5、2、3 um的一維光柵，而在空氣中高度依序為346.51、359.46、359.93、364.8 nm的結構。由於高分子刷一端固定於表面，另一端可隨環境的改變而呈現不同樣貌，將一維光柵置於pH=4水中，發現高度依序變為706.02、648.21、625.32、724.14 nm,而置於pH=9水中，高度依序變為946、995、950、1080 nm，可知高分子受不同酸鹼環境時影響會有500nm高度上的差異，可應用於環境檢測器。進一步將磁性奈米粒子吸附於PMAA高分子刷上，利用磁力控制高分子刷的形貌，製作出磁感應型高分子。

In this study, we grafted Poly(PMAA) brushes from the initiator-modified surface of patterned silicon wafer by atom transfer radical polymerization (ATRP) to fabricate the Sequentially, we immobilized iron nanoparticles (Fe3O4) on the PMAA side chain to generate magnetism -induced polymer grating.
One-dimensional grating of the polymer brushes on the silicon wafer with the different widths are 1 , 1.5 , 2 , 3 m and thickness is 346.51、359.46、359.93、364.8 nm. Polymer brush is Stimuli-responsive; that is they dehydrate and collapse when Environment is change .When the pH is 4 , thicknesses were changed to 706.02、648.21、625.32、724.14 nm,due to the presponsive pH-behavior of PMAA . Than the thicknesses were switched to 946、995、950、1080 nm at pH 9. There are almost 500nm changes of thickness, so we cam make the application in grating sensor.
Furthermore, we immobilized iron nanoparticles (Fe3O4) on the PMAA brushes, and then we use magnetic field to change the morphology of the PMAA brushes surface. In the future we can produce a magnetism-induced morphology actuator.

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