Volume 5

Issue 11,2012

(8 articles)

Dong Ick Son1, Byoung Wook Kwon1, Jeong Do Yang1, Dong Hee Park1, Won Seon Seo2, Hyunbok Lee3, Yeonjin Yi3, Chang Lyoul Lee4, and Won Kook Choi1 ()

ZnO–graphene quasi core–shell quantum dot (QD) structures, in which the inner ZnO QDs are covered with graphene nanoshells, have been synthesized via a simple solution method. Time-correlated single photon counting measurements gave average lifetime of 0.13 ns and 0.165 ns for the 375 and 383 nm ultraviolet (UV) emissions, respectively. These values were approximately 10 times faster than those of 1.86 ns and 1.83 ns of the reference ZnO QDs. Based on these superior UV properties, a multilayer structure hybrid UV photovoltaic cell was fabricated using ZnO–graphene core–shell QDs as an active layer and its performance was tested.
2012, 5(11): 747–761

Xiaolu Liu1, Haimin Zhang1, Xiangdong Yao2, Taicheng An3, Porun Liu1, Yun Wang1, Feng Peng4, Anthony R. Carroll1, and Huijun Zhao1 ()

A pure rutile TiO2 photoanode with 100% exposed pyramid-shaped (111) surfaces has been directly synthesized onto a conducting substrate via a facile hydrothermal process and showed excellent visible light photoelectrocatalytic activity toward oxidation of water and organics, owing to the presence of bulk-doped Ti3+ and the high reactivity of {111} facets.
2012, 5(11): 762–769

Juanjuan Peng1, Yun Sun1, Qian Liu1, Yang Yang1, Jing Zhou1, Wei Feng1 (), Xianzhong Zhang2, and Fuyou Li1 ()

The effects of upconversion nanoparticles (UCNPs) on the growth of plants have been investigated, and it was found that low concentrations promote the development of mung beans. UCNPs are excreted with feces without any detectable toxic effects on exposed mice.
2012, 5(11): 770–782

Sharon Xiaodai Lim1,2, Gavin Kok Wai Koon2,3, Da Zhan5, Zexiang Shen5, Barbaros zyilmaz1,2,3,4, Chornghaur Sow1,2 ()

We present a simple method utilising a self-assembly process to bridge monolayer graphene across densified carbon nanotube (CNT) pillars/platforms/walls. The unique structure offers an alternative way to study the strain induced on the graphene sheet depending on the construct of the supporting structures. With the introduction of quantum dots into the system, a significant photocurrent effect hinted at the possibility of using this hybrid material for applications in future opto-electronic devices.
2012, 5(11): 783–795

Emmanouil Dimakis (), Manfred Ramsteiner, Abbes Tahraoui, Henning Riechert, and Lutz Geelhaar

So far, the use of Si as n-type dopant for GaAs nanowires has been hampered by its amphoteric behavior that leads to heavy charge- carrier compensation. We demonstrate how the doping amphotericity of Si is related to the growth mode and the growth kinetics, and how it can be controlled in favor of donor-like behavior by employing a shell-doping scheme under certain growth conditions.
2012, 5(11): 796–804

Choong-Heui Chung, Tze-Bin Song, Brion Bob, Rui Zhu, and Yang Yang ()

Surrounding silver nanowires by conductive indium tin oxide nanoparticles offers low wire to wire junction resistance, smooth surface morphology and excellent mechanical adhesion and flexibility while maintaining the high transmittance and the low sheet resistance.
2012, 5(11): 805–814

Hongwei Chen (), Peng Zou, Jamie Connarn, Hayley Paholak, and Duxin Sun ()

Using quantum dots (QDs) labeled with a different color organic dye, we directly visualize the intracellular fate of the polymer coating from the inorganic nanoparticles via fluorescence microscopy. Our work suggests that the polymer coating of inorganic nanoparticles is disrupted after internalization by cancer cells.
2012, 5(11): 815–825

Yongcai Qiu1,2, Gui-Liang Xu3, Qin Kuang2, Shi-Gang Sun3, and Shihe Yang1,2 ()

Morphology-conserved transformation affords hierarchical WO3 flowers made of porous single-crystalline nanoplates, which exhibit enhanced lithium storage and photocatalysis.
2012, 5(11): 826–832