Nanostructured Pure Anatase Titania Tubes Replicated from Electrospun Polymer Fiber Templates by Atomic Layer Deposition

Magnetic Co 3 O 4 nanoparticles were prepared by using microporous regenerated cellulose films as sacrificial scaffolds. The cellulose macromolecules and the porous structure of the films made them used as spatially confined reacting sites where Co(OH) 2 nanoparticles could be synthesized in situ. When the cellulose matrix was removed by sintering at 500°C, Co 3 O 4 nanoparticles were obtained. XRD and XPS indicated that the prepared nanoparticles were pure Co 3 O 4 without any impurity. TEM and SEM images revealed that the particle size of the nanoparticles was smaller than 100 nm. The nanoparticles had weak ferromagnetic properties at 25°C. Furthermore, the pronounced quantum confinement effects of the synthesized nanoparticles have been observed, the optical bandgap energies determined were about 1.92 * 2.12 and 2.74 * 2.76 eV for O 2-? Co 3? and O 2-? Co 2? charge-transfer processes, respectively. Furthermore, the resulted Co 3 O 4 nanoparticles behaved stable electrochemical performance with promising applications in the electrode for lithium ion battery.

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“…9. The relationship between optical density and E g can be related by the equation (Kim et al 2008):…”

Section: Resultsmentioning

confidence: 99%

Cellulose scaffolds modulated synthesis of Co3O4 nanocrystals: preparation, characterization and properties

Liu

Zhou

et al. 2011

Cellulose

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“…Different PEO concentrations (10,15,17,20 New Era Pump Systems, Inc. and a 1 ml plastic syringe with a blunt metal needle. Different electrospinning parameters including solution concentration, distance between the needle and the collector, applied voltage, feeding rate and needle size as summarized in Table 1 were examined in…”

Section: Sample Preparationmentioning

confidence: 99%

“…The increase in demand for these nanostructures is mainly attributed to their unique electrical, optical, magnetic, thermal, mechanical and chemical properties [5,9]. Several fabrication methods including electrochemical deposition [10], electroless deposition [11], sol-gel [12], chemical vapour deposition (CVD) [13,14], and atomic layer deposition (ALD) [15] have been utilized to deposit 1D carbon [13,14], metal [15], oxide [12], semiconducting [12], polymer [10], and hybrid [11] nanostructures. However, the CVD and ALD processes require high deposition temperatures, typically ranging between 500 °C and 900 °C.…”

Section: Introductionmentioning

confidence: 99%

Morphology of electrospun poly(ethylene oxide) ultra-fine fibres with incorporated MoO3 nanoparticles

et al. 2017

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N-type semiconducting molybdenum trioxide (MoO3) nanoparticles embedded in polyethylene oxide (PEO) polymer ultra-fine fibres were deposited directly onto silicon substrates using an electrospinning technique. The effects of different MoO3/PEO concentrations as well as electrospinning parameters on the fibre morphologies were examined. Experimental results show that embedding nanoparticles and electrospinning onto small areas can be achieved without use of solvents or transfer of the deposited nanostructures. This approach offers a cost effective fabrication method to produce a diverse range of multifunctional materials for many applications including electronics, mechanical enhancement, drug delivery and gas sensing.

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“…In principle, the excited electron-hole pair forms a bound state, i.e., Wannier excitation, and the behavior of the excitation may be calculated by using a ''confined excitation'' model which gives an increase in the apparent bandgap energy. In semiconductor physics, the general expression that relates the absorption coefficient to the energy bandgap is given by (Kim et al 2008b) ahm ¼ kðhm À E g Þ n where E g represents the optical bandgap, hm is the energy of the photon, k is a constant. In fact, n assumes values of 1/2, 3/2, 2 and 3 for allowed direct, forbidden direct, allowed indirect, and forbidden indirect transitions, respectively.…”

Section: Effect Of Cellulose Matrix On Propertiesmentioning

confidence: 99%

Construction of inorganic nanoparticles by micro-nano-porous structure of cellulose matrix

Liu

Zeng

et al. 2011

Cellulose

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In our previous work, the CdS nanoparticles/cellulose films exhibited significantly high photocatalytic H 2 production efficiency under visible light irradiation than the ordinary CdS photocatalyst. In present paper, the CdS nanoparticles were synthesized in situ in pores of the regenerated cellulose substrate and the porous structure of cellulose, formation of the CdS nanoparticles and interactions between CdS and cellulose matrix in the composite films were investigated deeply. The experimental results indicated that the micro-nano-porous structure of the cellulose matrix could be used easily to create inorganic nanoparticles, which supplied not only cavities for the formation of nanoparticles, but also a shell (semistiff cellulose molecules support the pore wall) to protect their nano-structure. When the cellulose films with porous structure at wet state were immersed into inorganic ions solution, the ions interacted immediately with the -OH groups of cellulose, and then transformed into inorganic composite via another treatment, finally inorganic nanoparticles formed during the dry. The pore size of the cellulose matrix decreased from 180 nm (at wet state) to about 18 nm (at dry state), leading to the formation of nanoparticles. The results revealed that the CdS nanoparticles with a mean particle diameter about 6 nm were dispersed well, and were immobilized tightly in the cellulose matrix, resulting in a portable photocatalyst with high efficiency for photocatalytic for H 2 evolution. This is simple and ''green'' pathway to prepare the organicinorganic hybrid materials.

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Nanostructured Pure Anatase Titania Tubes Replicated from Electrospun Polymer Fiber Templates by Atomic Layer Deposition

Cited by 108 publications

References 41 publications

Cellulose scaffolds modulated synthesis of Co3O4 nanocrystals: preparation, characterization and properties

Cellulose scaffolds modulated synthesis of Co3O4 nanocrystals: preparation, characterization and properties

Morphology of electrospun poly(ethylene oxide) ultra-fine fibres with incorporated MoO3 nanoparticles

Construction of inorganic nanoparticles by micro-nano-porous structure of cellulose matrix

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