The use of aligned silver nanorod Arrays prepared by oblique angle deposition as surface enhanced Raman scattering substrates
The use of aligned silver nanorod Arrays prepared by oblique angle deposition as surface enhanced Raman scattering substrates
复制标题
DOI：
10.1021/jp075288u
复制
发表时间：
2008-01-31
影响因子：
3.7
通讯作者：
Dluhy, Richard A.
中科院分区：
文献类型：
--
作者：
Driskell, Jeremy D.;Shanmukh, Saratchandra;Dluhy, Richard A.
采用斜角气相沉积法在玻璃衬底上制备了银纳米棒阵列。通过扫描电子显微镜、透射电子显微镜和X射线衍射对银棒的表面形貌和结构进行了研究。发现单个纳米棒主要是圆柱形的，尽管具有棒的不规则形状的表面突起。以反式-1，2-二（4-吡啶基）乙烯为探针分子，在785 nm的激发波长下，研究了纳米棒长度对表面增强拉曼散射（Sers）响应的影响。当纳米棒长度接近868 nm时，增强因子达到最大值，接近5 × 10（8），然后当纳米棒长度进一步增加到1900 nm时，增强因子降低到接近3 × 10（6）。对于868 nm纳米棒阵列，在同一衬底内的多个点上收集的信号导致10%的相对标准偏差（RSD），而在从不同衬底收集的信号中测量到15%的RSD。当储存在食品真空袋中时，基底在Sers强度方面稳定超过2个月。这项研究表明，OAD银纳米棒阵列是高灵敏度，均匀，稳定的Sers基底，适用于各种表面化学分析应用。
Aligned Ag nanorod arrays have been fabricated on glass substrates using an oblique angle vapor deposition (OAD) method. The surface morphology and structure of the Ag rods were studied by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. Individual nanorods were found to be primarily cylindrical, albeit with irregularly shaped surface protrusions of the rods. The surface enhanced Raman scattering (SERS) response as a function of nanorod length was investigated using trans-1,2-bis(4-pyridyl)ethene as a probe molecule at an excitation wavelength of 785 nm. The enhancement factors reached a maximum of similar to 5 x 10(8) as the nanorod length approached 868 nm and then decreased to similar to 3 x 10(6) as the nanorod length increased further to 1900 nm. For the 868 nm nanorod array, signals collected over multiple spots within the same substrate resulted in a relative standard deviation (RSD) of 10%, while an RSD of 15% was measured in signals collected from different substrates. When stored in a food vacuum bag, the substrates are stable with respect to SERS intensity for greater than 2 months. This study demonstrates that the OAD Ag nanorod arrays are highly sensitive, uniform, and stable SERS substrates that are suitable for a variety of surface chemical analysis applications.