Volume 5

Issue 10,2012

(8 articles)

Nima Rouhi1, Santiago Capdevila2, Dheeraj Jain1, Katayoun Zand1, Yung Yu Wang1, Elliott Brown3, Lluis Jofre2, and Peter Burke1()

This paper provides a comprehensive study of both single and multilayer graphene sheet conductance behavior in the broadband frequency range from DC to 1 THz.
2012, 5(10): 667–678

Jing Yu1, Rui Hao1, Fugeng Sheng2 (), Lili Xu2, Gongjie Li2, and Yanglong Hou1 ()

Hollow manganese phosphate nanoparticles (HMP NPs) conjugated with folic acid (FA) have been developed for pH-selective magnetic resonance imaging (MRI) and drug delivery. The cavity of HMP NPs can be loaded with the anti-cancer drug doxorubicin (DOX), and the resulting material can target cells overexpressing the folate receptor, release drugs in a pH-triggered manner, and give remarkable improvements in MRI.
2012, 5(10): 679–694

Wei Chun Tan1, Mario Hofmann2 (), Ya-Ping Hsieh3 (), Meng Lin Lu1, and Yang Fang Chen1 ()

The use of graphene electronic devices as a sensitive sensing platform for surface plasmons is demonstrated.
2012, 5(10): 695–702

Xiang Zhou1,3,§, Fabrice Laroche4,5,§, Gerda E. M. Lamers4, Vincenzo Torraca4, Patrick Voskamp1, Tao Lu3, Fuqiang Chu2, Herman P. Spaink4,5 (), Jan Pieter Abrahams1 (), and Zunfeng Liu1,2,6 ()

Ultra-small graphene oxide (USGO)has been prepared by an epoxy ring opening reaction and functionalized with polyethyleneimine (PEI). Very efficient gene delivery into cells and zebrafish embryos was achieved using the PEI-grafted-USGO.
2012, 5(10): 703–709

Mi Jung Lee1, Jin Sik Choi1, Jin-Soo Kim1, Ik-Su Byun1, Duk Hyun Lee1, Sunmin Ryu2, Changgu Lee3 (), and Bae Ho Park1 ()

After a week long exposure to high humidity, the evolution of dendritic wrinkles could be observed in exfoliated graphene on a SiO2 substrate. Small, faint wrinkles coalesced into larger wrinkles. Particularly intense wrinkle evolution resulted in the formation of folded graphene. Moreover, the graphene height changed from 3.9 Å to ~12 Å after exposure to high humidity. It appeared that a double ice-like water layer (~8 Å) formed between graphene and the SiO2 substrate under high humidity conditions, thereby elevating the graphene layer. Although mechanically exfoliated monolayer graphene on mica showed the same height changes following high humidity exposure, we did not find any evidence of wrinkle formation in this case.
2012, 5(10): 710–717

Ju Feng1,§, Yongye Liang1,§, Hailiang Wang1, Yanguang Li1, Bo Zhang1, Jigang Zhou2, Jian Wang2, Tom Regier2, and Hongjie Dai1 ()

Sustainable catalysts for the oxygen reduction reaction (ORR) have been developed by rational design of manganese oxide/nanocarbon hybrids. Manganese oxide nanoparticles were grown on graphene to afford strong carbon–oxide interactions. The addition of mildly oxidized multi-walled nanotubes enhanced the conductivity and catalytic activity of the hybrid. An air calcination step was also found important in order to achieve high ORR activity of the resulting hybrid.
2012, 5(10): 718–725

Hui Sun1, Gui-Liang Xu2, Yue-Feng Xu2, Shi-Gang Sun2 (), Xinfeng Zhang1, Yongcai Qiu1, and Shihe Yang1 ()

A sulfur–graphene composite with uniformly dispersed sulfur on the graphene sheets has been prepared by an aqueous one-pot synthesis involving the simultaneous oxidation of sulfide and reduction of graphene oxide. When used as the cathode of a rechargeable lithium–sulfur battery, the as-prepared composite materials with a sulfur content of 63.6% delivered a reversible capacity of 804 mA•h/g at 0.186 C after 80 cycles, and 440 mA•h/g at 0.75 C after 500 cycles of charge/discharge.
2012, 5(10): 726–738

Jian Wang1,2 (), Handong Li3,4, Cuizu Chang5,6, Ke He5, Joon Sue Lee2, Haizhou Lu3, Yi Sun1, Xucun Ma5, Nitin Samarth2, Shunqing Shen3, Qikun Xue5,6, Maohai Xie3, and Moses H. W. Chan2 ()

The high quality Bi2Se3 topological insulator thin films have been fabricated by molecular beam epitaxy (a) and analyzed by angle-resolved photoemission spectroscopy (b). Transport measurements under an in-plane magnetic field, perpendicular to (c) and along (d) the bias current show anomalous opposite magnetoresistance.
2012, 5(10): 739–746