翁祖谦课题组介绍
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研究组主要是探讨表界面间电子转移和能量传递的超快过程，包括光致反应、光电催化、电化学反应等，研究其反应途径与机理，以及生物酶蛋白的金属氧化还原中心的功能结构。发展X射线谱学方法学（XAS、XES、IXS）与实验探测技术，研制高能量分辨X射线光谱仪（图 1,2,3）。在同步辐射设施和X射线自由电子激光装置应用X射线光谱技术，在原位反应条件下，结合时间分辨技术，配合第一原理计算，表征反应位点电子结构，进行能源材料的机理研究。
目前在研项目主要包括三个方面：（1）利用pump-probe探测技术研究光催化反应的电荷转移动力学（图 4,5,6）；（2）（光）电催化反应催化剂的制备、表征和机理研究（图 7）；（3）用于X射线光谱仪的元件和材料的制备研究（图 8,9,10）。
图 1：研制的高能量分辨X射线光谱仪
图 2：依托高能量分辨能谱仪发展的先进X射线谱学方法学
图 3：多维超快X射线谱学
图 4：利用超快光谱技术研究量子点表面缺陷对电子转移过程影响。（a）泵浦探测技术原理示意图；（b）（c）CdSe QDs的瞬态吸收光谱。
图 5：（a）（b）在酸处理前后，测试ZnO中的 Zn L-edge和 O K-edge的XAS，证明了ZnO经酸处理后氧空位增多；（c）通用同步加速器超快泵浦探测束示意图。
图 6：通过调控碳源和掺杂前驱体，合成具有UV- Visible波段的荧光发射的碳点。基于瞬态吸收光谱（TA）,研究碳点的碳核态、表面缺陷态和分子态，在光催化体系下的电荷转移动力学过程。
图 7：采用电化学沉积的手段制备了高效能的电解水催化剂，利用XPS，XAS等手段证明了Fe原子对Ni原子的价态的调控，通过FTIR以及Raman光谱证明了羧酸自由基的存在，采用动力学同位素实验证明在析氧反应中发生的质子耦合电子转移过程。
图 8：利用激光直写光刻和反应离子束刻蚀实现可见光波段的金刚石光栅制备，实现核心刻蚀工艺的突破。目前致力于金刚石离子束注入光刻的实现，实现高效率高准确度的金刚石光刻工艺。
图 9：将硅/锗/石英晶片压弯并粘接在玻璃基底上，保证曲率半径和表面形貌满足使用条件。使用胶水粘合工艺，完成半径1000mm弯晶单色器的制备，且表面RMS、聚焦性能、曲率半径等几何面型参数与成品弯晶接近。
图 10：利用脉冲激光沉积技术(Pulsed Laser Deposition)在衬底上沉积BiFeO3 (BFO)薄膜，用XRD和RSM(Reciprocal Space Mapping），AFM技术来判断薄膜生长的质量，并采用C-AFM(Conductive-AFM)，PFM(Piezoresponse Force Microscopy)等方法来进行电学测试，同时结合课题组的XAS技术，研究BFO薄膜的晶体结构，铁电性以及反铁磁性三者之间的耦合关系和其他独特性质。左图为PLD技术示意图，右图为经过氢氟酸酸洗后得到的具有原子台阶的SrTiO3衬底表面的AFM测试结果。
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元春泽
副研究员
研究方向：光电催化反应动力学研究；电化学能源材料和金属离子电池的研究。
邮箱 Email：yuanchz@shanghaitech.edu.cn
