Mesoporous nano-crystalline titania structures for hydrogen sensing

a nano-crystalline titania and hydrogen sensing technology, applied in the field of nano-scale structures, can solve the problems of slow response time, poor selectivity of titania systems, and limiting performance indicia such as response and sensitivity

Inactive Publication Date: 2006-05-18
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, the surface area of the sensing element is limited, thereby limiting performance indicia such as response and sensitivity.
Present systems that utilize titania suffer from poor selectivity and slow response times.
The conventional porous materials with regular pore sizes, such as zeolites, have limitati

Method used

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  • Mesoporous nano-crystalline titania structures for hydrogen sensing
  • Mesoporous nano-crystalline titania structures for hydrogen sensing
  • Mesoporous nano-crystalline titania structures for hydrogen sensing

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Embodiment Construction

[0022] A preferred embodiment of the invention is now described in detail. Referring to the drawings, like numbers indicate like parts throughout the views. As used in the description herein and throughout the claims, the following terms take the meanings explicitly associated herein, unless the context clearly dictates otherwise: the meaning of “a,”“an,” and “the” includes plural reference, the meaning of “in” includes “in” and “on.” Unless otherwise specified herein, the drawings are not necessarily drawn to scale. Also, as used herein “mesoporous nanocrystalline hybrid material” refers to a porous material with nanoscale crystals and an amorphous matrix. Diameters of pores and passages listed herein refer to average diameters to provide for eccentricity.

[0023] As shown in FIG. 1, one illustrative embodiment includes a structure 100 that includes a substantially non-conductive frame 110. The frame 110 has at least one exterior surface 114 and defines a plurality of passages 120 t...

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Abstract

A structure includes a substantially non-conductive frame having an exterior surface. The structure defines a plurality of passages that open to the exterior surface. Mesoporous material is disposed in the plurality of passages and is supported therein by the frame. In a method for making a mesoporous nanocrystalline titania hybrid material, a templating agent, an acid, and a titania precursor is mixed into a template liquid. A frame that defines a plurality of passages is placed into the template liquid. A solvent is evaporated from the template liquid, thereby forming a titania gel encapsulating the templating agent. The gel is heated to remove substantially the templating agent from the non-conductive frame and the titania, thereby leaving a mesoporous titania material.

Description

BACKGROUND [0001] 1. Field of the Invention [0002] The invention relates to nanoscale structures and, more specifically, to a nano-crystalline titania structure that may be used in sensor applications. [0003] 2. Description of the Prior Art [0004] Presently, hydrogen sensors employ electrochemical, optical or thermal detection methods. One system employs titania nanotubes arranged in an array. Such systems generally have pore sizes of greater than about 20 nm. Thus, the surface area of the sensing element is limited, thereby limiting performance indicia such as response and sensitivity. Recently, there has been renewed interest in metal oxide semiconductor-based devices. In titania, for example, the presence of hydrogen can dramatically change the resistivity of the material through a variety of physical mechanisms. The most common sensors depend on Schottky barrier modulation in structures with Pd or Pt electrodes. Present systems that utilize titania suffer from poor selectivity a...

Claims

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Application Information

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IPC IPC(8): B32B3/10
CPCB82Y15/00B82Y30/00C04B35/46C04B38/0045Y10S977/957G01N33/005Y10T428/24273Y10S977/953C04B2111/00827C04B38/0003C04B38/0054
Inventor KU, ANTHONY YU-CHUNGLOUREIRO, SERGIO PAULO MARTINSRUUD, JAMES ANTHONY
Owner GENERAL ELECTRIC CO
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