Low cost tips for tip-enhanced Raman spectroscopy fabricated by two-step electrochemical etching of 125 μm diameter gold wires

被引：15

作者：

Foti, Antonino ^{[1
,4
]}

Barreca, Francesco ^{[2
]}

Fazio, Enza ^{[2
]}

D'Andrea, Cristiano ^{[3
]}

Matteini, Paolo ^{[3
]}

Marago, Onofrio Maria ^{[1
]}

Gucciardi, Pietro Giuseppe ^{[1
]}

机构：

[1] CNR, IPCF, Viale F Stagno DAlcontres 37, I-98168 Messina, Italy

[2] Univ Messina, Dipartimento Sci Matemat & Informat Sci Fis & Sci, Viale F Stagno dAlcontres 31, I-98168 Messina, Italy

[3] IFAC CNR, Natl Res Council, Inst Appl Phys Nello Carrara, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy

[4] Ecole Polytech, CNRS, LPICM, F-91128 Palaiseau, France

来源：

BEILSTEIN JOURNAL OF NANOTECHNOLOGY | 2018年 / 9卷

基金：

欧盟地平线“2020”;

关键词：

amyloid; enhanced spectroscopy; gold tips; plasmonics; TERS; FIELD OPTICAL MICROSCOPY; SINGLE-MOLECULE; SURFACE CHARACTERIZATION; CRYSTAL VIOLET; SCATTERING; LIGHT; SILVER; SERS; RESOLUTION; OLIGOMERS;

D O I：

10.3762/bjnano.9.254

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Tip-enhanced Raman spectroscopy (TERS) has become a well-applied technique for nanospectroscopy, allowing for single molecule sensitivity with sub-nanometer spatial resolution. The demand for efficient, reproducible and cost-effective probes for TERS is increasing. Here we report on a new electrochemical etching protocol to fabricate TERS tips starting from 125 mu m diameter gold wires in a reproducible way. The process is reliable (50% of the tips have radius of curvature <35 nm, 66% <80 nm), fast (less than 2 min) and 2.5 times cheaper than the etching of standard 250 mu m diameter wires. The TERS performance of the tips is tested on dyes, pigments and biomolecules and enhancement factors higher than 10(5) are observed. TERS mapping with a spatial resolution of 5 nm is demonstrated.

引用

页码：2718 / 2729

页数：12

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