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Combining Metal-Organic Frameworks a...

Kreno, Lauren Elizabeth.

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Combining Metal-Organic Frameworks and Plasmonic Nanostructures for Sensing Applications.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Combining Metal-Organic Frameworks and Plasmonic Nanostructures for Sensing Applications./
作者:	Kreno, Lauren Elizabeth.
面頁冊數:	182 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.
Contained By:	Dissertation Abstracts International75-01B(E).
標題:	Chemistry, Inorganic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3595641
ISBN:	9781303415029

Combining Metal-Organic Frameworks and Plasmonic Nanostructures for Sensing Applications.
Kreno, Lauren Elizabeth.

Combining Metal-Organic Frameworks and Plasmonic Nanostructures for Sensing Applications. - 182 p.

Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.

Thesis (Ph.D.)--Northwestern University, 2013.

Sensing devices are crucial for industrial process management, medical diagnostics, food quality control, occupational safety, environmental monitoring, and chemical and biological threat detection. Thanks to decades of research, sensors come in many forms and are made of diverse materials, but improvements are always needed to decrease response time, lower cost, and increase selectivity. This work demonstrates unique approaches to sensing gases and vapors by combining porous materials called metal-organic frameworks (MOFs) with plasmonic nanomaterials. Plasmonic nanoparticles enable very sensitive detection of refractive index changes by measuring wavelength shifts in the particles' UV-vis spectrum, a technique called localized surface plasmon resonance spectroscopy (LSPRS). The initial cursory demonstration of LSPRS-based gas sensing was published near the start of this thesis work, and a deeper study of the gas sensor characteristics is detailed in this dissertation. In practice, the major limitation to this approach is its inherent non-selectivity. To improve this technique, MOFs can concentrate gases at the surface of plasmonic nanoparticles and can do so selectively.

ISBN: 9781303415029Subjects--Topical Terms:

517253
Chemistry, Inorganic.

Combining Metal-Organic Frameworks and Plasmonic Nanostructures for Sensing Applications.
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500 $a Advisers: Richard P. Van Duyne; Joseph T. Hupp.
502 $a Thesis (Ph.D.)--Northwestern University, 2013.
520 $a Sensing devices are crucial for industrial process management, medical diagnostics, food quality control, occupational safety, environmental monitoring, and chemical and biological threat detection. Thanks to decades of research, sensors come in many forms and are made of diverse materials, but improvements are always needed to decrease response time, lower cost, and increase selectivity. This work demonstrates unique approaches to sensing gases and vapors by combining porous materials called metal-organic frameworks (MOFs) with plasmonic nanomaterials. Plasmonic nanoparticles enable very sensitive detection of refractive index changes by measuring wavelength shifts in the particles' UV-vis spectrum, a technique called localized surface plasmon resonance spectroscopy (LSPRS). The initial cursory demonstration of LSPRS-based gas sensing was published near the start of this thesis work, and a deeper study of the gas sensor characteristics is detailed in this dissertation. In practice, the major limitation to this approach is its inherent non-selectivity. To improve this technique, MOFs can concentrate gases at the surface of plasmonic nanoparticles and can do so selectively.
520 $a This is first shown with the iconic MOF "HKUST-1" which concentrates CO2 to amplify the plasmonic sensor response 14x. Subsequently, multi-layered MOFs are explored for detecting CO2 while excluding water. Water is an omnipresent interferant that often impedes the absorption of more interesting guests. The approach of creating multilayered structures of hydrophobic/hydrophilic MOFs is also extended to bulk core/shell materials.
520 $a Finally, surface-enhanced Raman spectroscopy (SERS) is probed as a means of achieving molecular identification using MOFs. Through coating a MOF film on a SERS-active surface, it is possible to adsorb vapors that are normally difficult to detect by SERS because they have no affinity for the nanoparticle surface. Unexpectedly, adsorption of these vapors occurs throughout the thickness of the film, despite that the molecules are too large to infiltrate the MOF micropores. Observation of this unusual behavior that is not micropore-dominated has significant implications for future developments of MOF films in devices.
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