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

外国特許コード F110003966
整理番号 I021P002WO
掲載日 2011年7月7日
出願国 欧州特許庁(EPO)
出願番号 08841615
公報番号 2214001
公報番号 2214001
出願日 平成20年10月24日(2008.10.24)
公報発行日 平成22年8月4日(2010.8.4)
公報発行日 平成30年4月18日(2018.4.18)
国際出願番号 JP2008069366
国際公開番号 WO2009054507
国際出願日 平成20年10月24日(2008.10.24)
国際公開日 平成21年4月30日(2009.4.30)
優先権データ
  • 特願2007-276691 (2007.10.24) JP
  • 2008WO-JP69366 (2008.10.24) WO
発明の名称 (英語) Raman probe comprising a field amplifying element and method for its production and uses
発明の概要(英語) (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.
特許請求の範囲(英語) [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.
  • 出願人(英語)
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • NATIONAL INSTITUTE FOR MATERIALS SCIENCE
  • 発明者(英語)
  • SHINGAYA YOSHITAKA
  • NAKAYAMA TOMONOBU
  • AONO MASAKAZU
国際特許分類(IPC)
欧州特許分類/主・副
  • G01N021/65D
  • S01N021/65D
指定国 (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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