Swelling-Assisted Sequential Infiltration Synthesis of Nanoporous ZnO Films with Highly Accessible Pores and Their Sensing Potential for Ethanol
Swelling-Assisted Sequential Infiltration Synthesis of Nanoporous ZnO Films with Highly Accessible Pores and Their Sensing Potential for Ethanol
复制标题
溶胀辅助序贯渗透法制备高分散性ZnO纳米多孔薄膜及其对乙醇的敏感性
DOI：
10.1021/acsami.1c08225
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发表时间：
2021-07-23
影响因子：
9.5
通讯作者：
Berman, Diana
中科院分区：
文献类型：
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作者：
Pleshek, Daniel;Tran, John;Berman, Diana
YHere，我们报告了一种溶胀辅助顺序渗透合成（SIS）方法，用于设计高度多孔的氧化锌（ZnO）薄膜，通过渗透嵌段共聚物模板，如聚苯乙烯-嵌段-聚乙烯基吡啶与无机前体，然后通过UV臭氧辅助去除聚合物模板。我们表明，多孔ZnO涂层的厚度在140和420 nm之间的范围内，可以得到使用只有五个周期的SIS。通过溶胀辅助SIS制备的ZnO中的孔是高度可及的，并且高达98%的孔可用于溶剂渗透。XPS数据表明，纳米多孔ZnO薄膜的表面被-OH基团封端。密度泛函理论计算表明，在ZnO表面存在-OH基团的情况下，乙醇诱导释放的氧限制耗尽层的能量势垒较低，因此，它可以导致更高的灵敏度在传感乙醇。我们监测的响应ZnO多孔涂层具有不同的厚度和孔隙率，乙醇蒸汽使用组合的质量为基础的和chemiresistive的方法在室温和90摄氏度。多孔ZnO保形涂层揭示了一个有前途的灵敏度在低温下检测乙醇。我们的研究结果表明，良好的潜力的SIS方法的共形ZnO涂层的设计与控制的孔隙率，厚度和组合物，可适用于传感应用。
YHere, we report a swelling-assisted sequential infiltration synthesis (SIS) approach for the design of highly porous zinc oxide (ZnO) films by infiltration of block copolymer templates such as polystyrene-block- polyvinyl pyridine with inorganic precursors followed by UV ozone-assisted removal of the polymer template. We show that porous ZnO coatings with the thickness in the range between 140 and 420 nm can be obtained using only five cycles of SIS. The pores in ZnO fabricated via swelling-assisted SIS are highly accessible, and up to 98% of pores are available for solvent penetration. The XPS data indicate that the surface of nanoporous ZnO films is terminated with -OH groups. Density functional theory calculations show a lower energy barrier for ethanol-induced release of the oxygen restricted depletion layer in the case of the presence of -OH groups at the ZnO surface, and hence, it can lead to higher sensitivity in sensing of ethanol. We monitored the response of ZnO porous coatings with different thicknesses and porosities to ethanol vapors using combined mass-based and chemiresistive approaches at room temperature and 90 degrees C. The porous ZnO conformal coatings reveal a promising sensitivity toward detection of ethanol at low temperatures. Our results suggest the excellent potential of the SIS approach for the design of conformal ZnO coatings with controlled porosity, thickness, and composition that can be adapted for sensing applications.