Controlled synthesis of monodisperse manganese oxide nanocrystals

Si, Honglei; Wang, Hongzhe; Shen, Huaibin; Zhou, Changhua; Li, Sen; Lou, Shiyun; Xu, Weiwei; Du, Zuliang; Li, Lin Song

doi:10.1039/b901603c

Cited by 20 publications

(15 citation statements)

References 31 publications

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“…This is due to the fact that only small amounts of surfactants are expected to be left on the surface of TiO 2 nanoparticles. Also, the FTIR spectrum (A1) of OA-OM-capped-TiO 2 nanoparticles shows a vibration band at 1379 cm -1 , which is identical to that observed on the FTIR spectrum of pure OM [31]. This indicates the presence of OM on the surface of OA-OM-capped-TiO 2 nanoparticles.…”

Section: Uv-vis Characterizationsupporting

confidence: 52%

The effect of TiO2 surface modification on the photovoltaic properties of hybrid bulk heterojunction solar cells based on MEH-PPV/CdS/TiO2 active layer

Patel

Mighri

et al. 2015

Green Processing and Synthesis

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In this work, we present the synthesis details of uniform shape and size-controlled titanium dioxide (TiO 2 ) nanorods followed by the deposition of cadmium sulfide (CdS) quantum dots on their surface. The achieved surfactant-capped-TiO 2 nanorods as well as CdS/TiO 2 nanocomposites were dispersed in nonpolar solvents, which enabled an easy solution blending with poly ( 2-methoxy, 5-(2-ethyl-hexy-loxy)-p-phenyl vinylene) (MEH-PPV) conjugated polymer to prepare the active layer of bulk hetero junction solar cells (BHJSCs). The properties of the synthesized capped-TiO 2 nanorods, CdS/TiO 2 nanocomposites, as well as those of their corresponding blends with MEH-PPV were characterized using transmission electron microscopy (TEM), thermogravimetric analysis (TGA), UVVisible spectroscopy, and photoluminescence (PL) technique. The characterization of the effect of the surfactants (oleic acid, OA, olyamine, OM, and 6-aminohexanoic acid, 6AHA) left on TiO 2 surface and CdS surface modification on BHJSC photovoltaic power conversion efficiency (PCE) showed that: i) for the same surfactants, when CdS was added on the surface of TiO 2 nanorods, the PCE increased due to the higher efficiency of CdS compared to MEH-PPV; and ii) the best PEC was obtained with CdS/ OA-6AHA-capped-TiO 2 nanocomposite due to the shortest length of the carbon-chain of 6AHA, leading to higher charge carrier mobility.

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Section: Uv-vis Characterizationsupporting

confidence: 52%

The effect of TiO2 surface modification on the photovoltaic properties of hybrid bulk heterojunction solar cells based on MEH-PPV/CdS/TiO2 active layer

Patel

Mighri

et al. 2015

Green Processing and Synthesis

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“…Therefore, most of the previously reported results related to BiVO 4 ‐based photoanodes were measured in sulfite oxidation condition to show photo‐electrochemical properties of BiVO 4 ‐based electrodes independently of its poor water oxidation kinetics, as shown in Table S2 (Supporting Information). The photo‐electrochemical current densities of the BiVO 4 ‐based photoanodes were plotted as a function of potential versus RHE. Thus, we measured PEC properties of BiVO 4 ‐based anodes under sulfite oxidation to figure out the effect of ligand engineering.…”

Section: Resultsmentioning

confidence: 99%

“…The use of Mn‐based catalysts for efficient water oxidation has been widely studied, due to the presence of biological water oxidizing complex in photosystem II, which comprises four manganese and one calcium atoms. Moreover, high cost‐effectiveness (Mn is the 10th most abundant element in the earth's crust), low toxicity, and robust stability in neutral condition are other attractive properties of a manganese‐based catalyst as OECs . In addition, the multioxidation states of manganese‐based catalyst would facilitate the local hole transport around Mn centers via a low barrier of OMnO pathway, which is likely to boost the water oxidation activity .…”

Section: Introductionmentioning

confidence: 99%

Efficient Water Splitting Cascade Photoanodes with Ligand‐Engineered MnO Cocatalysts

et al. 2018

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The band edge positions of semiconductors determine functionality in solar water splitting. While ligand exchange is known to enable modification of the band structure, its crucial role in water splitting efficiency is not yet fully understood. Here, ligand‐engineered manganese oxide cocatalyst nanoparticles (MnO NPs) on bismuth vanadate (BiVO4) anodes are first demonstrated, and a remarkably enhanced photocurrent density of 6.25 mA cm−2 is achieved. It is close to 85% of the theoretical photocurrent density (≈7.5 mA cm−2) of BiVO4. Improved photoactivity is closely related to the substantial shifts in band edge energies that originate from both the induced dipole at the ligand/MnO interface and the intrinsic dipole of the ligand. Combined spectroscopic analysis and electrochemical study reveal the clear relationship between the surface modification and the band edge positions for water oxidation. The proposed concept has considerable potential to explore new, efficient solar water splitting systems.

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“…For example, octahedral MnO nanocrystals were obtained through the thermal decomposition of Mn(Ac) 2 . Both Mn 3 O 4 and MnO nanocrystals were simultaneously formed upon the pyrolysis of Mn(acac) 2 . A recent study disclosed that the formation of Mn 2+ ‐oleylamine is more kinetically favorable, while the formation of Mn 2+ ‐oleate is more thermodynamically favorable.…”

Section: Magnetic Nanoparticle Design and Controlled Synthesis Stratementioning

confidence: 99%

Small is Smarter: Nano MRI Contrast Agents – Advantages and Recent Achievements

Gao

Zhao

et al. 2015

Small

162

123

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Many challenges for advanced sensitive and noninvasive clinical diagnostic imaging remain unmatched. In particular, the great potential of magnetic nano-probes is intensively discussed to further improve the performance of magnetic resonance imaging (MRI), especially for cancer diagnosis. Based on recent achievements, here the concepts of magnetic nanoparticle-based MRI contrast agents and tumor-specific imaging probes are critically summarized. Advances in their synthesis, biocompatible chemical and biofunctional surface modifications, and current strategies for further developing them into multimodality imaging probes are discussed. In addition, how engineered versus unintended surface coatings such as protein coronas affect the biocompatibility and performance of MRI nano-probes is also considered. To stimulate progress in the field, future strategies and relevant challenges that still need to be resolved in the field conclude this review.

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Controlled synthesis of monodisperse manganese oxide nanocrystals

Cited by 20 publications

References 31 publications

The effect of TiO2 surface modification on the photovoltaic properties of hybrid bulk heterojunction solar cells based on MEH-PPV/CdS/TiO2 active layer

The effect of TiO2 surface modification on the photovoltaic properties of hybrid bulk heterojunction solar cells based on MEH-PPV/CdS/TiO2 active layer

Efficient Water Splitting Cascade Photoanodes with Ligand‐Engineered MnO Cocatalysts

Small is Smarter: Nano MRI Contrast Agents – Advantages and Recent Achievements

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