Investigations of the composition of macro-, micro- and nanoporous silicon surface by ultrasoft X-ray spectroscopy and X-ray photoelectron spectroscopy

Lenshin, A. S.; Кашкаров, В. М.; Domashevskaya, É. P.; Bel’tyukov, A. L.; Гильмутдинов, Ф. З.

doi:10.1016/j.apsusc.2015.10.140

Cited by 20 publications

(8 citation statements)

References 22 publications

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“…It is worth mention that the Si 2p spectra of NH 2 -MSNs showed a single peak at 102.3 eV, which was marginally higher than that of NH 2 -ASNs at 101.9 eV. Considering the fact that the characteristic Si 2p BE peaks of elementary Si and SiO 2 reported in the literature are at 99.5 and 103.5 eV 79 , respectively, our results imply that silicon in the surface layer of NH 2 -ASNs and NH 2 -MSNs may exist as intermediate sub-oxide phases (SiO x , 0 < x ≤ 1) rather than the fully oxidized SiO 2 79,80 due to a greater presence of elementary non-oxidized Si in the surface layers of NH 2 -ASNs and NH 2 -MSNs. Furthermore, these values were consistent with those reported for functionalized silica nanoparticles 39,81 , and mesoporous silica 6,46 systems.…”

Section: Cr(vi) Adsorption and Removal Efficiency Of Asns Msns Nh 2supporting

confidence: 52%

A systematic study of hexavalent chromium adsorption and removal from aqueous environments using chemically functionalized amorphous and mesoporous silica nanoparticles

Jang

Pack

Kim

et al. 2020

Sci Rep

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We report on the synthesis and characterization of highly monodisperse amorphous silica nanoparticles (ASNs) and mesoporous silica nanoparticles (MSNs) with particle sizes of 15-60 nm. We demonstrate adsorption of cr(Vi) ions on amino-functionalized ASns (nH 2-ASNs) and MSNs (NH 2-MSNs) and their removal from aqueous environments and show the specific surface area (SSA) of NH 2-MSNs is four times as larger as that of nH 2-ASNs and that more than 70% of the total SSA of NH 2-MSNs is due to the presence of nanopores. Analyses of Cr(VI) adsorption kinetics on NH 2-ASNs and NH 2-MSNs exhibited relatively rapid adsorption behavior following pseudo-second order kinetics as determined by nonlinear fitting. NH 2-ASNs and NH 2-MSNs exhibited significantly higher Cr(VI) adsorption capacities of 34.0 and 42.2 mg•g −1 and removal efficiencies of 61.9 and 76.8% than those of unfunctionalized ASNs and MSNs, respectively. The Langmuir model resulted in best fits to the adsorption isotherms of NH 2-ASns and nH 2-MSNs. The adsorption of Cr(VI) on NH 2-ASNs and NH 2-MSNs was an endothermic and spontaneous process according to the thermodynamic analyses of temperature-dependent adsorption isotherms. The removal efficiencies of NH 2-ASNs and NH 2-MSNs exhibited a moderate reduction of less than 25% of the maximum values after five regeneration cycles. Furthermore, NH 2-MSNs were also found to reduce adsorbed Cr(VI) into less harmful Cr(III).

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Section: Cr(vi) Adsorption and Removal Efficiency Of Asns Msns Nh 2supporting

confidence: 52%

A systematic study of hexavalent chromium adsorption and removal from aqueous environments using chemically functionalized amorphous and mesoporous silica nanoparticles

Jang

Pack

Kim

et al. 2020

Sci Rep

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“…As substrates for the growth of AlxGa1-xN/ AlN layers, we used both traditional substrates of monocrystalline KDB (111) silicon and the same substrates with a nanoporous layer previously formed according to an original technique described in [9], with a thickness of about 20 nm and an average pore diameter less than 5 nm.…”

Section: Methodsmentioning

confidence: 99%

“…To solve these problems, various attempts have been recently made, in order to deploy different transition buffer layers of A3N/Si into the heterostructure [6][7][8][9]. Buffer layers can involve multiperiodic super-lattices, the layers with alternating 2D and 3D morphology, layers with a gradual variation of the composition as well as their combinations.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the growth and composition of AlxGa1-xN/AlN/Si heterostructures with the use of the buffer layer of porous silicon

Lenshin

Zolotukhin

Bel’tyukov

et al. 2022

J. Phys.: Conf. Ser.

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The work is concerned with the efficiency of inclusion of the additional layer of por-Si applied as a buffer into the growth technology of AlxGa1-xN/AlN/Si as well as its influence on the morphological parameters and composition of surface of the grown heterostructures. In the course of the study, it was found that the heterostructure grown using a nanoporous por-Si buffer layer on a Si(111) n-type monocrystalline silicon wafer has a more homogeneous structure of the epitaxial layer and its surface morphology.

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“…О б з о р н ы е с п е к т р ы XPS. Обзорные XPS-спектры и спектры остовных уровней образцов исходного por-Si и НК Sn/por-Si были измерены на ла-бораторном спектрометре фирмы SPECS ФТИ УрО РАН по методике, описанной выше и аналогичной использо-ванной в работе [16]. Съемка образцов проводилась без травления и с травлением аргонной пушкой в течение 1 и 3 min.…”

Section: результаты и обсуждениеunclassified

“…Анализ Si 2p-спектров показывает, что полученные данные по составу " мезопористого" кремния хорошо согласуются с известными литературными данными. Ранее нами было установлено [16,17], что поверх-ностные слои пористого кремния состоят из диоксида кремния (Si 2p, E b = 103.5 eV), субоксидов кремния (Si 2p, E b = 100.5−103 eV) и неокисленного кремния в кристаллическом или аморфном состоянии (Si 2p, E b = 99.5 eV). При этом известно и многократно под-тверждено, что со временем хранения доля оксидных фаз в пористом слое растет, особенно в поверхност-ных слоях.…”

Section: результаты и обсуждениеunclassified

Состав Нанокомпозитов Из Тонких Слоев Олова На Пористом Кремнии, Сформированных Методом Магнетронного Распыления

Леньшин¹,

Кашкаров²,

Домашевская³

et al. 2017

Физика Твердого Тела

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С использованием методов растровой электронной микроскопии и рентгеновской фотоэлектронной спектроскопии проведены исследования особенностей морфологии и состава поверхности нанокомпозитов из тонких слоев олова на пористом кремнии, сформированных методом магнетронного распыления. Обнаружено, что сформированные нанокомпозиты в зависимости от толщины осажденного слоя олова различаются между собой соотношением основных фаз: диоксида олова, субоксида и металлического олова. При этом доля окисленного олова в фазовом составе композитов уменьшается от поверхности к объему образца. Установлено, что осаждение нанослоев олова не приводит к значительному изменению фазового состава подложки пористого кремния.

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Investigations of the composition of macro-, micro- and nanoporous silicon surface by ultrasoft X-ray spectroscopy and X-ray photoelectron spectroscopy

Cited by 20 publications

References 22 publications

A systematic study of hexavalent chromium adsorption and removal from aqueous environments using chemically functionalized amorphous and mesoporous silica nanoparticles

A systematic study of hexavalent chromium adsorption and removal from aqueous environments using chemically functionalized amorphous and mesoporous silica nanoparticles

Characteristics of the growth and composition of AlxGa1-xN/AlN/Si heterostructures with the use of the buffer layer of porous silicon

Состав Нанокомпозитов Из Тонких Слоев Олова На Пористом Кремнии, Сформированных Методом Магнетронного Распыления

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