Improvement on organic compound adsorption and/or detection by using metallic thin films deposited onto highly rough silicon substrates

Carvalho, Alexsander Tressino de; Silva, M.L.P. da; Filho, A.P. Nascimento; Jesus, Dosil Pereira de; Filho, S. G. Santos

doi:10.1016/j.snb.2004.11.065

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…this minimum airflow rate. However, copper surface adsorbs [35] n-hexane molecules and the signal is not recovered for several minutes, i.e., adsorbed molecules are slowly released. The channel array allowed quicker sample removal in any flow condition.…”

Section: Apparatus Performancementioning

confidence: 99%

“…For instance, it was used on gaseous phase for benzene [27,34,35] or cyclobezene [36] hydrogenation and in liquid phase for functionalization [37]. Although copper is uncommon in catalysis, Yu et al [34] used a copper surface as a catalyst for methanol reforming at low temperature (232 • C, 40% yield for methanol), in the liquid phase, copper salt was used to produce methanol from methane [38] and CuO increased catalytic properties of TiO 2 thin film [39].…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional microchannels as a simple microreactor

Carvalho

Lima

Silva

et al. 2009

Sensors and Actuators B: Chemical

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Section: Apparatus Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three-dimensional microchannels as a simple microreactor

Carvalho

Lima

Silva

et al. 2009

Sensors and Actuators B: Chemical

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“…HMDS plasma films 32 show interesting characteristics, such as selective permeation of alcohol in aqueous solutions. Moreover non-planar microchannels covered with HMDS films showed good adsorption properties for organic compounds on air 29 and cavities also showed some facilities for testing several different substrates 33 .…”

Section: Introductionmentioning

confidence: 99%

Preconcentration in gas or liquid phases using adsorbent thin films

Filho¹,

Carvalho²,

Silva³

et al. 2006

Mat. Res.

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The possibility of preconcentration on microchannels for organic compounds in gas or liquid phases was evaluated. Microstructures with different geometries were mechanically machined using poly(methyl methacrylate) - PMMA as substrates and some cavities were covered with cellulose. The surfaces of the microchannels were modified by plasma deposition of hydrophilic or hydrophobic films using 2-propanol and hexamethyldisilazane (HMDS), respectively. Double layers of HMDS + 2-propanol were also used. Adsorption characterization was made by Quartz Crystal Measurements (QCM) technique using reactants in a large polarity range that showed the adsorption ability of the structures depends more on the films used than on the capillary phenomena. Cellulose modified by double layer film showed a high retention capacity for all gaseous compounds tested. However, structures without plasma deposition showed low retention capacity. Microchannels modified with double layers or 2-propanol plasma films showed higher retention than non-modified ones on gas or liquid phase

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