Selective area<i>in situ</i>conversion of Si (0 0 1) hydrophobic to hydrophilic surface by excimer laser irradiation in hydrogen peroxide

Liu, Neng; Huang, Xiangyong; Dubowski, Jan J.

doi:10.1088/0022-3727/47/38/385106

Cited by 24 publications

(19 citation statements)

References 49 publications

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“…Treated parent KCC-1 and metal oxide loaded KCC-1 displayed sharp bands at 3740 and 3735 cm –1 with a small band around 3655 cm –1 (Figure A). Peaks at 3740 and 3735 cm –1 were ascribed to terminal and geminal silanol groups, while the band at 3655 cm –1 showed the existence of H-bonded hydroxyls. − Peaks ascribed to the stretching vibration of structural OH and nonacidic or inaccessible OH were also found at 3675 and 3633 cm –1 . , The same trend was found by Long et al, where a nonacidic hydroxyl band formed after calcination at 773 K . Upon introduction of metal oxide, the peak shifted to 3735 cm –1 due to elimination of some of the 3740 cm –1 peak by perturbation of the silica framework.…”

Section: Resultssupporting

confidence: 72%

Tailoring the Properties of Metal Oxide Loaded/KCC-1 toward a Different Mechanism of CO₂ Methanation by in Situ IR and ESR

et al. 2018

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Nickel (Ni), cobalt (Co), and zinc (Zn) loaded on fibrous silica KCC-1 was investigated for CO methanation reactions. Ni/KCC-1 exhibits the highest catalyst performance with a CH formation rate of 33.02 × 10 mol mol s, 1.77 times higher than that of Co/KCC-1 followed by Zn/KCC-1 and finally the parent KCC-1. A pyrrole adsorption FTIR study reveals shifting of perturbed N-H stretching decreasing slightly with the addition of metal oxide, suggesting that the basic sites of catalyst were inaccessible due to metal oxide deposition. The strengths of basicity were found to follow sthe equence KCC-1, Ni/KCC-1, Zn/KCC-1, and Co/KCC-1. The data were supported by N adsorption desorption analysis, where Co/KCC-1 displayed the greatest reduction in total surface area whereas Ni/KCC-1 displayed the least reduction. The elucidation of difference mechanism pathways has also been studied by in situ IR spectroscopy studies to determine the role of different metal oxides in CO methanation. It was discovered that Ni/KCC-1 and Co/KCC-1 follow a dissociative mechanism of CO methanation in which the CO molecule was dissociated on the surface of the metal oxide before migration onto the catalyst surface. This was confirmed by the evolution of a peak corresponding to carbonyl species (CO) on a metal oxide surface in FTIR spectra. Zn/KCC-1, on the other hand, showed no such peak, indicating associative methanation pathways where a hydrogen molecule interacts with an O atom in CO to form CO and OH. These results offers a better understanding for catalytic studies, particularly in the field of CO recycling.

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Section: Resultssupporting

confidence: 72%

Tailoring the Properties of Metal Oxide Loaded/KCC-1 toward a Different Mechanism of CO₂ Methanation by in Situ IR and ESR

et al. 2018

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“…In agreement with the Si 2p core level spectrum, the rst peak was attributed to the O-Si in the bridging of the Si-O-Si segments, 68,74,75 while the second peak was attributed to the terminal hydroxyl groups in the aerogel bulk (Si-O-H). 66,75,76 The O 1s core level spectra of the GnP-modied PE-b-Si provided more insights into the mechanism of the GnP interaction with the PE-b-Si matrix (Fig. 8).…”

Section: Chemical Characterizationsupporting

confidence: 71%

The effect of graphene-nanoplatelets on gelation and structural integrity of a polyvinyltrimethoxysilane-based aerogel

et al. 2019

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“…These representative results have been presented in our previous published work 23,24 . Figure 1 shows the CA vs. N (number of pulses) on sites irradiated by KrF laser at 250 mJ/cm 2 Figure 2B.…”

Section: Representative Resultssupporting

confidence: 59%

Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment

Liu

Moumanis

Dubowski

2015

JoVE

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The wettability of silicon (Si) is one of the important parameters in the technology of surface functionalization of this material and fabrication of biosensing devices. We report on a protocol of using KrF and ArF lasers irradiating Si (001) samples immersed in a liquid environment with low number of pulses and operating at moderately low pulse fluences to induce Si wettability modification. Wafers immersed for up to 4 hr in a 0.01% H 2 O 2 /H 2 O solution did not show measurable change in their initial contact angle (CA) ~75°. However, the 500-pulse KrF and ArF lasers irradiation of such wafers in a microchamber filled with 0.01% H 2 O 2 /H 2 O solution at 250 and 65 mJ/cm 2 , respectively, has decreased the CA to near 15°, indicating the formation of a superhydrophilic surface. The formation of OH-terminated Si (001), with no measurable change of the wafer's surface morphology, has been confirmed by X-ray photoelectron spectroscopy and atomic force microscopy measurements. The selective area irradiated samples were then immersed in a biotin-conjugated fluorescein-stained nanospheres solution for 2 hr, resulting in a successful immobilization of the nanospheres in the non-irradiated area. This illustrates the potential of the method for selective area biofunctionalization and fabrication of advanced Si-based biosensing architectures. We also describe a similar protocol of irradiation of wafers immersed in methanol (CH 3 OH) using ArF laser operating at pulse fluence of 65 mJ/cm 2 and in situ formation of a strongly hydrophobic surface of Si (001) with the CA of 103°. The XPS results indicate ArF laser induced formation of Si-(OCH 3 ) x compounds responsible for the observed hydrophobicity. However, no such compounds were found by XPS on the Si surface irradiated by KrF laser in methanol, demonstrating the inability of the KrF laser to photodissociate methanol and create -OCH 3 radicals. Video LinkThe video component of this article can be found at

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Selective areain situconversion of Si (0 0 1) hydrophobic to hydrophilic surface by excimer laser irradiation in hydrogen peroxide

Cited by 24 publications

References 49 publications

Tailoring the Properties of Metal Oxide Loaded/KCC-1 toward a Different Mechanism of CO₂ Methanation by in Situ IR and ESR

Tailoring the Properties of Metal Oxide Loaded/KCC-1 toward a Different Mechanism of CO₂ Methanation by in Situ IR and ESR

The effect of graphene-nanoplatelets on gelation and structural integrity of a polyvinyltrimethoxysilane-based aerogel

Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment

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Selective areain situconversion of Si (0 0 1) hydrophobic to hydrophilic surface by excimer laser irradiation in hydrogen peroxide

Cited by 24 publications

References 49 publications

Tailoring the Properties of Metal Oxide Loaded/KCC-1 toward a Different Mechanism of CO2 Methanation by in Situ IR and ESR

Tailoring the Properties of Metal Oxide Loaded/KCC-1 toward a Different Mechanism of CO2 Methanation by in Situ IR and ESR

The effect of graphene-nanoplatelets on gelation and structural integrity of a polyvinyltrimethoxysilane-based aerogel

Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment

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Tailoring the Properties of Metal Oxide Loaded/KCC-1 toward a Different Mechanism of CO₂ Methanation by in Situ IR and ESR

Tailoring the Properties of Metal Oxide Loaded/KCC-1 toward a Different Mechanism of CO₂ Methanation by in Situ IR and ESR