Dataset for: Simultaneous Chemical and Refractive Index Sensing in the 1-2.5 micron Near-Infrared Wavelength Range on Nanoporous Gold Disks

We developed a new method to obtain chemical and refractive index sensing between the 1 and 2.5 micron near-infrared wavelength on nanoporous gold (NPG) disks. We fabricated NPG disks in the laboratory by sputtering a gold-silver alloy film onto a glass substrate at approximately 80 nm thickness. Polystyrene beads were deposited onto the alloy film in a single layer and were reduced in size using an oxygen plasma treatment. The bead pattern was transferred onto the alloy using a sputter-etch method in argon plasma. After etching, the alloy was sonicated in chloroform to remove residual beads. The disks were then dealloyed using nitric acid. We measured infrared absorption using dispersive scanning UV-Vis-NIR and FT-IR inteferometric spectrometers. This dataset reports the extinction spectra of water on NPG disks with diameters of either 350 or 600 nm. For NPG disks of 350 nm diameter the extinction spectra are also provided for 6 other solvents with different refractive indices: salt water, ethanol, hexane, iso-octane, hexadecane, and toluene. We examined the surface-enhanced near-infrared absorption of 350 nm and 600 nm diameter NPG disks with a self-assembled monolayer (SAM) of octadecanethiol (ODT) and report the extinction spectra in this dataset. The surface-enhanced near-infrared absorption (SENIRA) spectra of each of hexadecane, dodecane, siloxane, pyrene, and Louisiana sweet grade crude oil on either 350 nm or 600 nm NPG disks is reported in this dataset. Lastly we deposited a film poly(methyl methacrylate) (PMMA) of varying thickness onto the NPG disk substrate. The PMMA films varied in thickness from 50-150 nm. The surface-enhanced near-infrared absorption spectra of 350 nm and 600 nm NPG disks on films of 50-150 nm in thickness is reported in this dataset, as well as the wavelength shift at 1398 nm. This dataset is associated with the paper: Shih, W. - C., Santos, G. M., Zhao, F., Zenasni, O., & Arnob, M. M. P. (2016). Simultaneous Chemical and Refractive Index Sensing in the 1-2.5 μm Near-Infrared Wavelength Range on Nanoporous Gold Disks. Nano Lett., 16(7), 4641–4647, doi:10.1021/acs.nanolett.6b01959.

本研究开发了一种全新方法，可实现纳米多孔金（nanoporous gold, NPG）圆盘在1~2.5微米近红外波段的化学与折射率传感。本研究于实验室中制备NPG圆盘：首先通过磁控溅射法将厚度约80纳米的金-银合金薄膜沉积于玻璃衬底上；随后将聚苯乙烯微球以单层形式沉积于合金薄膜表面，并通过氧等离子体处理缩小微球尺寸；采用氩等离子体溅射刻蚀法将微球图案转移至合金薄膜之上；刻蚀完成后，将合金薄膜置于氯仿中超声处理以去除残留微球；最后通过硝酸对合金进行脱合金处理，得到NPG圆盘。本研究采用色散扫描型紫外-可见-近红外（UV-Vis-NIR）光谱仪与傅里叶变换红外（FT-IR）干涉光谱仪，对红外吸收特性进行表征。本数据集收录如下内容：直径为350纳米或600纳米的NPG圆盘表面负载水时的消光光谱；针对直径350纳米的NPG圆盘，额外提供盐水、乙醇、正己烷、异辛烷、十六烷、甲苯共6种不同折射率溶剂负载时的消光光谱；对负载有十八烷基硫醇（octadecanethiol, ODT）自组装单分子层（self-assembled monolayer, SAM）的直径350纳米与600纳米NPG圆盘的表面增强近红外吸收（SENIRA）光谱进行了表征，相关数据已收录至本数据集；本数据集还收录了以十六烷、十二烷、硅氧烷、芘、路易斯安那甜级原油为分析物，分别负载于直径350纳米或600纳米NPG圆盘时的表面增强近红外吸收光谱；此外，本数据集收录了负载于50~150纳米厚度聚甲基丙烯酸甲酯（poly(methyl methacrylate), PMMA）薄膜上的350纳米与600纳米NPG圆盘的表面增强近红外吸收光谱，以及其在1398纳米波长处的波长偏移量。本数据集关联论文如下：Shih, W.-C.、Santos, G.M.、Zhao, F.、Zenasni, O.、Arnob, M.M.P.（2016），《纳米多孔金圆盘在1~2.5微米近红外波段的同步化学与折射率传感》，*Nano Letters*（《纳米快报》），16(7)，4641–4647，DOI:10.1021/acs.nanolett.6b01959。