Yuanyuan Sun

Elemental superdoping of graphene and carbon nanotubes.

Doping of low-dimensional graphitic materials, including graphene, graphene quantum dots and single-wall carbon nanotubes with nitrogen, sulfur or boron can significantly change their properties. We report that simple fluorination followed by annealing in a dopant source can superdope low-dimensional graphitic materials with a high level of N, S or B. The superdoping results in the following doping levels: (i) for graphene, 29.82, 17.55 and 10.79u2009at% for N-, S- and B-doping, respectively; (ii) for graphene quantum dots, 36.38u2009at% for N-doping; and (iii) for single-wall carbon nanotubes, 7.79 and 10.66u2009at% for N- and S-doping, respectively. As an example, the N-superdoping of graphene can greatly increase the capacitive energy storage, increase the efficiency of the oxygen reduction reaction and induce ferromagnetism. Furthermore, by changing the degree of fluorination, the doping level can be tuned over a wide range, which is important for optimizing the performance of doped low-dimensional graphitic materials.

The effect of grain size on electrical transport and magnetic properties of La 0.9 Te 0.1 MnO 3.

Abstract The effect of grain size on structural, magnetic and transport properties in electron-doped manganites La0.9Te0.1MnO3 has been investigated. All samples show a rhombohedral structure with the space group R 3 ¯ C at room temperature. The Mn–O–Mn bond angle decreases and the Mn–O bond length increases with the increase of grain size. All samples undergo paramagnetic (PM)-ferromagnetic (FM) phase transitions and the interesting phenomenon that both magnetization and the Curie temperature TC decrease with increasing grain size is observed, which is suggested to mainly originate from the increase of the Mn–O bond length dMn–O. Additionally, ρ obviously increases with decreasing grain size due to the increase of both the height and width of tunneling barriers with decreasing grain size. The results indicate that both the intrinsic colossal magnetoresistance and the extrinsic interfacial magnetoresistance can be effectively tuned in La0.9Te0.1MnO3 by changing grain size.

Structural, magnetic, and transport properties in the Pr -doped manganites La 0.9 − x Pr x Te 0.1 MnO 3 ( 0 ⩽ x ⩽ 0.9 )

The effect of

Superconductivity enhancement in the S-doped Weyl semimetal candidate MoTe2

mathrm{Pr}

Strain-induced enhancement in the thermoelectric performance of a ZrS2 monolayer

-doping on structural, magnetic and transport properties in electron-doped manganites

Fabrication of La0.8Na0.2Mn1−xCuxO3 (x = 0, 0.05) thin films on YSZ substrates via chemical solution deposition

{mathrm{La}}_{0.9ensuremath{-}x}{mathrm{Pr}}_{x}{mathrm{Te}}_{0.1}{mathrm{MnO}}_{3}phantom{rule{0.3em}{0ex}}(0ensuremath{leqslant}xensuremath{leqslant}0.9)

Gram-scale synthesis of high-purity graphene quantum dots with multicolor photoluminescence

with fixed carrier concentration is investigated. The room temperature structural transition from rhombohedral

Intrinsic magnetism of monolayer graphene oxide quantum dots

(Roverline{3}C)

Photoinduced spin-state transition of Co3+ in the layered perovskite manganite thin film

to orthorhombic

Creation of localized spins in graphene by ring-opening of epoxy derived hydroxyl.

(Pbnm)