Nanoscale investigation of two-photon polymerized microstructures with tip-enhanced Raman spectroscopy
Nanoscale investigation of two-photon polymerized microstructures with tip-enhanced Raman spectroscopy
复制标题
用尖端增强拉曼光谱研究双光子聚合微观结构
DOI：
10.1088/2515-7647/abdcba
复制
发表时间：
2021-04-01
影响因子：
3.8
通讯作者：
Baldacchini, Tommaso
中科院分区：
文献类型：
--
作者：
Kazantseva, Anastasiya, V;Chernykh, Elena A.;Baldacchini, Tommaso
我们证明了使用尖端增强拉曼光谱（TERS）的聚合物微结构制造的双光子聚合直接激光写入（TPP-DLW）。与在共焦拉曼显微镜中获得的信号强度相比，当使用TERS时测量到几乎两倍的线性增强。由于TERS中的探测体积比共焦拉曼显微镜小得多，因此估计有效信号增强约为100%。10（4）.我们获得TPP微结构的化学地图，使用TERS与相对较短的采集时间和高空间分辨率所定义的金属尖端顶点曲率半径。我们利用这种高分辨率来研究聚丙烯微结构中聚合物网络的均匀性，这些微结构印刷在丙烯酸基树脂中。我们发现，聚合物的转化度变化约30%，在一个距离内只有100 nm。TERS提供的高分辨率地形和化学数据的组合为以非破坏性方式研究TPP-DLW材料提供了有效的分析工具。
We demonstrate the use of tip-enhanced Raman spectroscopy (TERS) on polymeric microstructures fabricated by two-photon polymerization direct laser writing (TPP-DLW). Compared to the signal intensity obtained in confocal Raman microscopy, a linear enhancement of almost two times is measured when using TERS. Because the probing volume is much smaller in TERS than in confocal Raman microscopy, the effective signal enhancement is estimated to be ca. 10(4). We obtain chemical maps of TPP microstructures using TERS with relatively short acquisition times and with high spatial resolution as defined by the metallic tip apex radius of curvature. We take advantage of this high resolution to study the homogeneity of the polymer network in TPP microstructures printed in an acrylic-based resin. We find that the polymer degree of conversion varies by about 30% within a distance of only 100 nm. The combination of high resolution topographical and chemical data delivered by TERS provides an effective analytical tool for studying TPP-DLW materials in a non-destructive way.