Preparation and characterization of ZrO2 nanoparticles capped by trioctylphosphine oxide (TOPO)

Ma, Jianqi

doi:10.1007/s11595-011-0277-2

Cited by 16 publications

(6 citation statements)

References 19 publications

(15 reference statements)

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“…34 By contrast, organic capping ligands show significantly greater volatility, and their departure likely terminates their role in passivating the surface of the NC. 35,36 Indeed, thermogravimetric analysis of TOPO, the ligand used to passivate the InP core surface, shows near-complete weight loss between 460 and 580 K (Supporting Information, S9). Thus, at temperatures as low as 500 K, organic ligands are expected to volatilize and likely leave behind surface trap states available to carriers, resulting in irreversible PL quenching.…”

Section: àmentioning

confidence: 99%

Thermal Stability of Colloidal InP Nanocrystals: Small Inorganic Ligands Boost High-Temperature Photoluminescence

et al. 2013

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We examine the stability of excitons in quantum-confined InP nanocrystals as a function of temperature elevation up to 800 K. Through the use of static and time-resolved spectroscopy, we find that small inorganic capping ligands substantially improve the temperature dependent photoluminescence quantum yield relative to native organic ligands and perform similarly to a wide band gap inorganic shell. For this composition, we identify the primary exciton loss mechanism as electron trapping through a combination of transient absorption and transient photoluminescence measurements. Density functional theory indicates little impact of studied inorganic ligands on InP core states, suggesting that reduced thermal degradation relative to organic ligands yields improved stability; this is further supported by a lack of size dependence in photoluminescence quenching, pointing to the dominance of surface processes, and by relative thermal stabilities of the surface passivating media. Thus, small inorganic ligands, which benefit device applications due to improved carrier access, also improve the electronic integrity of the material during elevated temperature operation and subsequent to high temperature material processing.

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Section: àmentioning

confidence: 99%

Thermal Stability of Colloidal InP Nanocrystals: Small Inorganic Ligands Boost High-Temperature Photoluminescence

et al. 2013

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“…The chemical interaction of TOPO molecules with PbS occurred via the P=O is responsible for the observed shift of this peak. The observed shift in P=O stretching vibrations is due to the capping of the nanoparticles by TOPO, which causes π-electron delocalization in P=O that effectively reduced the frequency of the P=O stretching mode, achieving as a result a lower absorption frequency, and red shift is observed [ 43 ].…”

Section: Resultsmentioning

confidence: 99%

Bis(4-methylpiperidine-1-carbodithioato)-lead(II) and Bis(4-benzylpiperidine-1-carbodithioato)-lead(II) as Precursors for Lead Sulphide Nano Photocatalysts for the Degradation of Rhodamine B

Mbuyazi

Ajibade

2021

Molecules

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Bis(4-methylpiperidine-1-carbodithioato)-lead(II) and bis(4-benzylpiperidine-1-carbodithioato)-lead(II) were prepared and their molecular structures elucidated using single crystal X-ray crystallography and spectroscopic techniques. The compounds were used as precursors for the preparation of lead sulphide nano photocatalysts for the degradation of rhodamine B. The single crystal structures of the lead(II) dithiocarbamate complexes show mononuclear lead(II) compounds in which each lead(II) ion coordinates two dithiocarbamato anions in a distorted tetrahedral geometry. The compounds were thermolyzed at 180 ℃ in hexadecylamine (HDA), octadecylamine (ODA), and trioctylphosphine oxide (TOPO) to prepare HDA, ODA, and TOPO capped lead sulphide (PbS) nanoparticles. Powder X-ray diffraction (pXRD) patterns of the lead sulphide nanoparticles were indexed to the rock cubic salt crystalline phase of lead sulphide. The lead sulphide nanoparticles were used as photocatalysts for the degradation of rhodamine B with ODA-PbS1 achieving photodegradation efficiency of 45.28% after 360 min. The photostability and reusability studies of the as-prepared PbS nanoparticles were studied in four consecutive cycles, showing that the percentage degradation efficiency decreased slightly by about 0.51–1.93%. The results show that the as-prepared PbS nanoparticles are relatively photostable with a slight loss of photodegradation activities as the reusability cycles progress.

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“…The spectrum of the nanoparticles showed peaks matching all of the TOPO peaks in frequency and relative intensity, except for the P=O stretch. The stretching vibration band of P=O in neat TOPO appears around 1149 cm −1 [40]. However, in the nanoparticles this peak is observed to have shifted from 1149 cm −1 to 1046 cm −1 .…”

Section: Ftir Of the Topo And Hda Capped Cds Nanoparticlesmentioning

confidence: 93%

“…Figure 6(a) shows the IR spectrum of the TOPO capped nanoparticles. The spectral peaks were compared with the peaks observed in the spectrum of neat TOPO [40]. In both spectra (neat TOPO and TOPO-CdS), the band at 2954 cm −1 is the dissymmetric stretching vibration of CH 3 , and the bands at 2921 and 2852 cm −1 are the dissymmetric and symmetric stretching vibrations of CH 2 , respectively.…”

Section: Ftir Of the Topo And Hda Capped Cds Nanoparticlesmentioning

confidence: 99%

Synthesis, Structural and Optical Properties of TOPO and HDA Capped Cadmium Sulphide Nanocrystals, and the Effect of Capping Ligand Concentration

Onwudiwe

Hrubaru

Ebenso

2015

Journal of Nanomaterials

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The thermal decomposition of bis(N,N-diallyldithiocarbamato)Cd(II) in a “one-pot” synthesis in tri-n-octylphosphine oxide (TOPO) and hexadecylamine (HDA) afforded CdS (TOPO-CdS and HDA-CdS) of varying optical properties and morphologies. The influence of the ratio of the precursor concentration to the capping molecule, as a factor affecting the morphology and size of the nanoparticles, was investigated. The particles varied in shape from spheres to rods and show quantum size effects in their optical spectra with clear differences in the photoluminescence (PL) spectra. The PL spectrum of the HDA capped CdS nanoparticles has an emission maximum centred at 468, 472, and 484 nm for the precursor to HDA concentration ratio of 1 : 10, 1 : 15, and 1 : 20, respectively, while the TOPO capped nanoparticles show emission peaks at 483, 494, and 498 nm at the same concentration ratio. Powdered X-ray diffraction (p-XRD) shows the nanoparticles to be hexagonal. The crystallinity of the nanoparticles was evident from high resolution transmission electron microscopy (HRTEM) which gave well-defined images of particles with clear lattice fringes.

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Preparation and characterization of ZrO2 nanoparticles capped by trioctylphosphine oxide (TOPO)

Cited by 16 publications

References 19 publications

Thermal Stability of Colloidal InP Nanocrystals: Small Inorganic Ligands Boost High-Temperature Photoluminescence

Thermal Stability of Colloidal InP Nanocrystals: Small Inorganic Ligands Boost High-Temperature Photoluminescence

Bis(4-methylpiperidine-1-carbodithioato)-lead(II) and Bis(4-benzylpiperidine-1-carbodithioato)-lead(II) as Precursors for Lead Sulphide Nano Photocatalysts for the Degradation of Rhodamine B

Synthesis, Structural and Optical Properties of TOPO and HDA Capped Cadmium Sulphide Nanocrystals, and the Effect of Capping Ligand Concentration

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