Rapid synthesis of TiO2 hollow nanostructures with crystallized walls by using CuO as template and microwave heating

Zhou, Hualan; Zhong, Zhijun; Wu, Sha; Ge, Fangzhou; Li, Ying; Shi, Wenjian

doi:10.1016/j.matlet.2011.01.007

Cited by 15 publications

(5 citation statements)

References 13 publications

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“…Quite a few studies − have been conducted to investigate the effect of these influential factors, but no solid conclusion was reached, and the understanding on the fate of NPs under different environmental conditions is still very limited. Although there were a few studies on the transport of TiO 2 NPs with particular reference to ionic strength and surfactants, , the influence of particle morphology is essentially lacking, hence the effects of ionic strength and surfactant on the aggregation kinetics are inconclusive.…”

Section: Introductionmentioning

confidence: 99%

Stability and Aggregation Kinetics of Titania Nanomaterials under Environmentally Realistic Conditions

Raza

Amjad

Kaur

et al. 2016

Environ. Sci. Technol.

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Nanoparticle morphology is 8 expected to play a significant role in the 9 stability, aggregation behaviour and 10 ultimate fate of engineered nanomaterials 11 in natural aquatic environments. The 12 aggregation kinetics of ellipsoidal and 13 spherical titanium dioxide (TiO 2 ) 14 nanoparticles (NP) under different 15 surfactant loadings, pH values and ionic strengths are investigated in this study. The stability results 16 reveal that alteration of surface charge is the stability determining factor. Among five different 17 surfactants investigated, sodium citrate and Suwannee river fulvic acid (SRFA) were the most 18 effective stabilizers. It was observed that both types of NP were more stable in monovalent salts 19 (NaCl and NaNO 3 ) as compared with divalent salts (Ca(NO 3 ) 2 and CaCl 2 ). The aggregation of 20 spherical TiO 2 NP demonstrated a strong dependency on the ionic strength regardless of the presence 21 of mono or divalent salts; while the ellipsoids exhibited a lower dependency on the ionic strength but 22 is more stable . This work acts as a benchmark study towards understanding the fate of stabilized NP 23 in natural environments that are rich in Ca(CO 3 ) 2 , NaNO 3 , NaCl and CaCl 2 along with natural organic 24 matters. 25

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Section: Introductionmentioning

confidence: 99%

Stability and Aggregation Kinetics of Titania Nanomaterials under Environmentally Realistic Conditions

Raza

Amjad

Kaur

et al. 2016

Environ. Sci. Technol.

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show abstract

“…18 CdS nanoparticles as effective light harvesters have been synthesized by various techniques like chemical bath deposition (CBD) 19 and successive ionic layer adsorption and reaction (SILAR). 17 On the other hand, the preparation of highly oriented rods, 20 hollow nanostructures, 21 and nanotubes 22 of TiO 2 have been proposed as a strategy to increase the effective surface area of TiO 2 nanostructures, which would in turn result in the enhancement of their photovoltaic performance. 23,24 Among the various chemical and physical routes, the hydrothermal process has been employed to grow titanium oxide nanocorals (TNC) and CdS nanoparticles deposited by SILAR.…”

Section: Introductionmentioning

confidence: 99%

CdS-sensitized TiO2 nanocorals: hydrothermal synthesis, characterization, application

Mali

Desai

Dalavi

et al. 2011

Photochem Photobiol Sci

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Cadmium sulfide (CdS) nanoparticle-sensitized titanium oxide nanocorals (TNC) were synthesized using a two-step deposition process. The TiO(2) nanocorals were grown on the conducting glass substrates (FTO) using A hydrothermal process and CdS nanoparticles were loaded on TNC using successive ionic layer adsorption and reaction (SILAR) method. The TiO(2), CdS and TiO(2)-CdS samples were characterized by optical absorption, X-ray diffraction (XRD), FT-Raman, FT-IR, scanning electron microscopy (SEM) and contact angle. Further, their photoelectrochemical (PEC) performance was tested in NaOH, Na(2)S-NaOH-S and Na(2)S electrolytes, respectively. When CdS nanoparticles are coated on TNCs, the optical absorption is found to be enhanced and band edge is red-shifted towards visible region. The TiO(2)-CdS sample exhibits improved photoelectrochemical (PEC) performance with maximum short circuit current of (J(sc)) 1.04 mA cm(-2). After applying these TiO(2)-CdS electrodes in photovoltaic cells, the photocurrent was found to be enhanced by 2.7 and 32.5 times, as compared with those of bare CdS and TiO(2) nanocorals films electrodes respectively. Also, the power conversion efficiency of TiO(2)-CdS electrodes is 0.72%, which is enhanced by about 16 and 29 times for TiO(2), CdS samples.

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“…The cut-off wavelength was observed at 385 nm, whereas slight absorption started in the range between 400 and 420 nm, and was centered at 410 nm. This finding is attributed to the deep energy level emission of traps within the band gap, which is due to the electron transition from the low donor level of the oxygen vacancies in the valence band of TiO 2 nanostructures excited by the incident light with lower energy than the band gap [69]. Optical response was studied using dynamic response time measurement by illuminating the MSM device with a pulsed UV light (365 nm) at different bias voltages to test the device repeatability.…”

Section: Current-voltage Characteristicsmentioning

confidence: 99%

Effects of variations in precursor concentration on the growth of rutile TiO2 nanorods on Si substrate with fabricated fast-response metal–semiconductor–metal UV detector

Selman

Hassan

2015

Optical Materials

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Rapid synthesis of TiO2 hollow nanostructures with crystallized walls by using CuO as template and microwave heating

Cited by 15 publications

References 13 publications

Stability and Aggregation Kinetics of Titania Nanomaterials under Environmentally Realistic Conditions

Stability and Aggregation Kinetics of Titania Nanomaterials under Environmentally Realistic Conditions

CdS-sensitized TiO2 nanocorals: hydrothermal synthesis, characterization, application

Effects of variations in precursor concentration on the growth of rutile TiO2 nanorods on Si substrate with fabricated fast-response metal–semiconductor–metal UV detector

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