Plants and microbes assisted selenium nanoparticles: characterization and application

Selenium is an essential trace element and is an essential component of many enzymes without which they become inactive. The Se nanoparticles of varying shape and size may be synthesized from Se salts especially selenite and selenates in presence of reducing agents such as proteins, phenols, alcohols and amines. These biomolecules can be used to reduce Se salts in vitro but the byproducts released in the environment may be hazardous to flora and fauna. In this review, therefore, we analysed in depth, the biogenic synthesis of Se nanoparticles, their characterization and transformation into t- Se, m-Se, Se-nanoballs, Se-nanowires and Se-hollow spheres in an innocuous way preventing the environment from pollution. Their shape, size, FTIR, UV?vis, Raman spectra, SEM, TEM images and XRD pattern have been analysed. The weak forces involved in aggregation and transformation of one nano structure into the other have been carefully resolved.

Azamal Husen

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Quantum dots incorporated magnetic nanoparticles for imaging colon carcinoma cells

Background: Engineered multifunctional nanoparticles (NPs) have made a tremendous impact on the biomedical sciences, with advances in imaging, sensing and bioseparation. In particular, the combination of optical and magnetic responses through a single particle system allows us to serve as novel multimodal molecular imaging contrast agents in clinical settings. Despite of essential medical imaging modalities and of significant clinical application, only few nanocomposites have been developed with dual imaging contrast. A new method for preparing quantum dots (QDs) incorporated magnetic nanoparticles (MNPs) based on layer-by-layer (LbL) self-assembly techniques have developed and used for cancer cells imaging. Methods: Here, citrate - capped negatively charged Fe3O4 NPs were prepared and coated with positively - charged hexadecyltrimethyl ammonium bromide (CTAB). Then, thiol - capped negatively charged CdTe QDs were electrostatically bound with CTAB. Morphological, optical and magnetic properties of the fluorescent magnetic nanoparticles (FMNPs) were characterized. Prepared FMNPs were additionally conjugated with hCC49 antibodies fragment antigen binding (Fab) having binding affinity to sialylated sugar chain of TAG-72 region of LS174T cancer cells, which was prepared silkworm expression system, and then were used for imaging colon carcinoma cells. Results: The prepared nanocomposites were magnetically responsive and fluorescent, simultaneously that are useful for efficient cellular imaging, optical sensing and magnetic separation. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) revealed that the particle size is around 50 nm in diameter with inner magnetic core and outer CdTe QDs core-shell structure. Cytotoxicity test of prepared FMNPs indicates high viability in Vero cells. NPs conjugated with anti cancer antibodies were successfully labeled on colon carcinoma cells (LS174) in vitro and showed significant specificity to target cells. Conclusion: The present report demonstrates a simple synthesis of CdTe QDs-Fe3O4 NPs. The surface of the prepared FMNPs was enabled simple conjugation to monoclonal antibodies by electrostatic interaction. This property further extended their in vitro applications as cellular imaging contrast agents. Such labeling of cells with new fluorescent-magneto nanoprobes for living detection is of interest to various biomedical applications and has demonstrated the potential for future medical use.

Syed Ahmed

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Graphene Synthesis via Magnetic Inductive Heating of Copper Substrates

ACS Nano

DOI: 10.1021/nn4031564

Richard Piner, Huifeng Li, Xianghua Kong, Li Tao, Iskandar N. Kholmanov, Hengxing Ji, Wi Hyoung Lee, Ji Won Suk, Jongpil Ye, Yufeng Hao, Shanshan Chen, Carl W. Magnuson, Ariel F. Ismach, Deji Akinwande and Rodney S. Ruoff

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Nongeminate Recombination Dynamics–Device Voltage Relationship in Hybrid PbS Quantum Dot/C60 Solar Cells

The Journal of Physical Chemistry C

DOI: 10.1021/jp4059824

James W. Ryan, Jose Manuel Marin-Beloqui, Josep Albero and Emilio Palomares

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Tunable Nanoscale Confinement of Energy and Resonant Edge Effect in Triangular Gold Nanoprisms

The Journal of Physical Chemistry C

DOI: 10.1021/jp4051929

Xi-bin Xu, Zao Yi, Xi-bo Li, Yu-ying Wang, Jin-pei Liu, Jiang-shan Luo, Bing-chi Luo, You-gen Yi and Yong-jian Tang

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Charge Transport in Highly Face-On Poly(3-hexylthiophene) Films

The Journal of Physical Chemistry C

DOI: 10.1021/jp4050644

Deepak Gargi, R. Joseph Kline, Dean M. DeLongchamp, Daniel A. Fischer, Michael F. Toney and Brendan T. O’Connor

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Near Infrared Emission Band and Origin in Ni(II)-Doped CdS Nanoribbons by CVD Technique

The Journal of Physical Chemistry C

DOI: 10.1021/jp402831n

Muhammad Arshad Kamran, RuiBin Liu, Li-Jie Shi, BingSuo Zou and Qingling Zhang

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Sorting Nanoparticles with Intertwined Plasmonic and Thermo-Hydrodynamical Forces

Nano Letters

DOI: 10.1021/nl401922p

A. Cuche, A. Canaguier-Durand, E. Devaux, J. A. Hutchison, C. Genet and T. W. Ebbesen

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Responsive Multidomain Free-Standing Films of Gold Nanoparticles Assembled by DNA-Directed Layer-by-Layer Approach

Nano Letters

DOI: 10.1021/nl4023308

Zaki G. Estephan, Zhaoxia Qian, Daeyeon Lee, John C. Crocker and So-Jung Park

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Electrical Spin Injection and Detection in Mn5Ge3/Ge/Mn5Ge3 Nanowire Transistors

Nano Letters

DOI: 10.1021/nl401238p

Jianshi Tang, Chiu-Yen Wang, Li-Te Chang, Yabin Fan, Tianxiao Nie, Michael Chan, Wanjun Jiang, Yu-Ting Chen, Hong-Jie Yang, Hsing-Yu Tuan, Lih-Juann Chen and Kang L. Wang

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Effect of Ammonia on Pt, Ru, Rh, and Ni Cathodes During the Alkaline Hydrogen Evolution Reaction

The Journal of Physical Chemistry C

DOI: 10.1021/jp405191c

Ramasamy Palaniappan and Gerardine G. Botte

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Electron Beam-Induced Writing of Nanoscale Iron Wires on a Functional Metal Oxide

The Journal of Physical Chemistry C

DOI: 10.1021/jp405640a

Florian Vollnhals, Tom Woolcot, Marie-Madeleine Walz, Steffen Seiler, Hans-Peter Steinrück, Geoff Thornton and Hubertus Marbach

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Nanoscale Structural Investigation of Cs2CO3-Doped MgO Sorbent for CO2 Capture at Moderate Temperature

The Journal of Physical Chemistry C

DOI: 10.1021/jp4024316

Maoyuan Liu, Christian Vogt, Alan L. Chaffee and Shery L. Y. Chang

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Wetting Layer: The Key Player in Plasma-Assisted Silicon Nanowire Growth Mediated by Tin

The Journal of Physical Chemistry C

DOI: 10.1021/jp403063d

Soumyadeep Misra, Linwei Yu, Wanghua Chen and Pere Roca i Cabarrocas

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Structural and Luminescence Properties of Yellow-Emitting NaScSi2O6:Eu2+ Phosphors: Eu2+ Site Preference Analysis and Generation of Red Emission by Codoping Mn2+ for White-Light-Emitting Diode Applications

The Journal of Physical Chemistry C

DOI: 10.1021/jp4062225

Zhiguo Xia, Yuanyuan Zhang, Maxim S. Molokeev and Victor V. Atuchin

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Determination of the Electronic Structure and UV–Vis Absorption Properties of (Na2–xCux)Ta4O11 from First-Principle Calculations

The Journal of Physical Chemistry C

DOI: 10.1021/jp405995w

Moussab Harb, Dilshad Masih, Samy Ould-Chikh, Philippe Sautet, Jean-Marie Basset and Kazuhiro Takanabe

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Plasmonic Chirogenesis from Gold Nanoparticles Superstructures

The Journal of Physical Chemistry C

DOI: 10.1021/jp405925q

Wenjing Yan, Wei Ma, Hua Kuang, Liqiang Liu, Libing Wang, Liguang Xu and Chuanlai Xu

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Molecular Engineering of Indoline-Based D–A−π–A Organic Sensitizers toward High Efficiency Performance from First-Principles Calculations

The Journal of Physical Chemistry C

DOI: 10.1021/jp402645h

Wei-Lu Ding, Dong-Mei Wang, Zhi-Yuan Geng, Xiao-Ling Zhao and Yun-Feng Yan

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Solvophobic versus Electrostatic Interactions Drive Spontaneous Adsorption of Porphyrins onto Inorganic Surfaces: A Full Noncovalent Approach

The Journal of Physical Chemistry C

DOI: 10.1021/jp405514m

Alessandro D’Urso, Alessandro Di Mauro, Alessandra Cunsolo, Roberto Purrello and Maria Elena Fragalà

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