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Raman probe comprising a field amplifying element and method for its production and uses

Foreign code F110003966
File No. I021P002WO
Posted date Jul 7, 2011
Country EPO
Application number 08841615
Gazette No. 2214001
Gazette No. 2214001
Date of filing Oct 24, 2008
Gazette Date Aug 4, 2010
Gazette Date Apr 18, 2018
International application number JP2008069366
International publication number WO2009054507
Date of international filing Oct 24, 2008
Date of international publication Apr 30, 2009
Priority data
  • P2007-276691 (Oct 24, 2007) JP
  • 2008WO-JP69366 (Oct 24, 2008) WO
Title Raman probe comprising a field amplifying element and method for its production and uses
Abstract (EP2214001)
The optical electric field enhancement element of the invention comprises a nanorod where a conductive layer and an insulating layer are laminated.
In particular, the optical electric field enhancement element comprising a tungsten oxide nanorod exhibits a high enhancement effect not by an aggregate of fine crystals but by the crystal structure itself, therefore securing good reproducibility and a stable Raman scattering enhancement effect.
A sensor comprising the optical electric field enhancement element enables various high-precision analyses heretofore impossible in the art.
Scope of claims [claim1]
1. An optical electric field enhancement element for enhancing an optical electric field, which comprises a nanorod comprising a conductive layer and an insulating layer laminated on each other.
[claim2]
2. The optical electric field enhancement element as claimed in claim 1, wherein the composition of the nanorod is WOx (2.5 <= x <= 3).
[claim3]
3. A probe formed of a metal for Raman scattering spectroscopy, wherein one or more optical electric field enhancement elements as claimed in claim 1 or 2 are formed as standing on the surface of the body thereof.
[claim4]
4. The probe as claimed in claim 3, wherein the optical electric field enhancement element is a rod-shaped tungsten oxide crystal having a composition of WOx (2.5 <= x <= 3) and having a diameter of from 10 to 100 nm and a length of from 100 nm to 30 micron m.
[claim5]
5. The probe as claimed in claim 4, wherein the optical electric field enhancement element comprises a WOx nanorod formed by filling an ultra-high vacuum chamber with oxygen under a pressure of from 5 X 10 **-7 to 5 X 10 **-5 Torr, heating a tungsten foil at 1000 to 1300 deg.C under the condition to thereby sublime tungsten oxide, then making the tungsten oxide deposited on the body formed of tungsten and heated at 600 to 800 deg.C, and growing it to stand thereon.
[claim6]
6. The probe as claimed in claim 3, wherein the optical electric field enhancement element comprises a tungsten oxide nanorod capable of exhibiting a high Raman scattering enhancing effect as having a {001} crystallographic shear structure in the crystal and having a nano-gap structure where the conductive planes on an atomic layer level are isolated from each other via an insulating layer.
[claim7]
7. The probe as claimed in claim 3, wherein the optical electric field enhancement element is formed through local oxidation of a tungsten oxide nanorod by laser irradiation in air, and this exhibits a Raman scattering enhancement effect of at least 10 **10, therefore enabling detection of single-molecule Raman scattering.
[claim8]
8. The probe as claimed in claim 3, wherein the optical electric field enhancement element is formed through local reduction of a tungsten oxide nanorod by heating in the presence of carbon or carbon monoxide, and this exhibits a Raman scattering enhancement effect of at least 10 **10, therefore enabling detection of single-molecule Raman scattering.
[claim9]
9. The probe as claimed in claim 3, wherein the probe enables detection of molecules existing in a thin concentration of at most 1 nM in an aqueous solution, owing to the Raman scattering enhancement effect of the tungsten oxide nanorod therein.
[claim10]
10. The probe as claimed in claim 3, wherein the probe enables detection of molecular vibration of single molecules in an aqueous solution, owing to the Raman scattering enhancement effect of the tungsten oxide nanorod therein.
[claim11]
11. The probe as claimed in claim 3, wherein the probe can be incorporated in a microscopic Raman spectroscopic device by arranging the tip part of the tungsten oxide nanorod at the focal position of the objective lens.
[claim12]
12. The probe as claimed in claim 3, wherein the probe can be incorporated in a scanning probe microscope by fusing the tungsten oxide nanorod with the probe tip of the scanning probe microscope by laser irradiation in such a state that one nanorod is kept standing at the probe tip.
[claim13]
13. The probe as claimed in claim 3, wherein the probe can induce local chemical reaction by exciting the molecules existing in the vicinity of the tungsten oxide nanorod by light or heat through photoirradiation of the nanorod.
  • Applicant
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • NATIONAL INSTITUTE FOR MATERIALS SCIENCE
  • Inventor
  • SHINGAYA YOSHITAKA
  • NAKAYAMA TOMONOBU
  • AONO MASAKAZU
IPC(International Patent Classification)
U.S. Cl./(Sub)
  • G01N021/65D
  • S01N021/65D
Specified countries (EP2214001)
Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
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