Sputtering deposition under limited adatom mobility: an effective method to prepare a SERS substrate based on Ag@ZnO composite deposited onto electrospun cellulose acetate fibers
Sputtering deposition under limited adatom mobility: an effective method to prepare a SERS substrate based on Ag@ZnO composite deposited onto electrospun cellulose acetate fibers
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DOI：
10.1007/s00339-023-07044-8
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发表时间：
2023-10
期刊：
影响因子：
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通讯作者：
Adrián Camacho-Berríos;O. Suárez
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文献类型：
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作者：
Adrián Camacho-Berríos;O. Suárez
溅射是一种著名的物理气相沉积方法，用于合成涂层和薄膜。当与其他技术相结合，如静电纺丝，它成为一种直接而有效的方法来制备能够呈现纳米和微米级各种形态结构的衬底。得到的衬底具有高比表面积，适合于气体传感和表面增强拉曼散射(SERS)等应用。本文报道了用磁控溅射法在醋酸纤维素纤维上沉积银/氧化锌(Ag@ZnO)的成功方法。通过调整溅射工艺参数，我们将沉积的氧化锌和银限制在有限的吸附原子迁移率条件下。二次电子成像显示，纤维上的氧化锌形貌在纳米尺度上呈柱状晶。拉曼光谱表明，所制得的氧化锌微晶具有纤锌矿结构。电子显微镜显示，在吸附原子迁移率有限和沉积时间短的情况下，在先前沉积的氧化锌覆盖纤维上溅射沉积银，生成了不同形状和大小的纳米颗粒。然后，以苯硫醇(BZT)和罗丹明6G(R6G)为探针分子，测试了Ag@ZnO/CA纤维的表面增强拉曼散射(SERS)。所有制备的复合材料对BZT和R6G都表现出良好的SERS响应。综上所述，该方法是制备Ag/ZnO基SERS衬底的一种实用而直接的方法。
Sputtering is a well-known physical vapor deposition method for the synthesis of coatings and thin films. When combined with other techniques, such as electrospinning, it becomes a straightforward yet effective method to prepare substrates that can render various morphological structures at the nano and micrometer scale. The resulting substrates possess high surface area, making them suitable for applications such as gas sensing and surface-enhanced Raman scattering (SERS). The present work reports the successful magnetron sputtering deposition of silver/zinc oxide (Ag@ZnO) onto cellulose acetate fibers. By adjusting the sputtering process parameters, we limited the deposition of ZnO and Ag to be under limited adatom mobility conditions. Secondary electron imaging revealed that the resulting ZnO morphology on the fibers presented a columnar grain morphology at the nanometer scale. The ZnO crystallites of the said grains possessed a wurtzite structure, as shown by Raman spectroscopy. Ag sputtering deposition onto the previously deposited ZnO-covered fibers, produced under limited adatom mobility and short deposition time, rendered nanoparticles of various shapes and sizes, as revealed by electron microscopy. Then, using benzenethiol (BZT) and rhodamine 6G (R6G) as the probe molecules, the Ag@ZnO/CA fibers were tested as SERS substrates. All the prepared composite materials showed good SERS response towards the BZT and R6G. In summary, the novel approach is a practical and straightforward route for preparing Ag/ZnO-based SERS substrates.