Room Temperature Multiferroicity of Charge Transfer Crystals

ACS Nano ◽  
2015 ◽  
Vol 9 (9) ◽  
pp. 9373-9379 ◽  
Author(s):  
Wei Qin ◽  
Xiaomin Chen ◽  
Huashan Li ◽  
Maogang Gong ◽  
Guoliang Yuan ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Room Temperature

Charge Transfer Driven by Redox Dye Molecules on Graphene Nanosheets for Room-Temperature Gas Sensing

Nanoscale ◽  
2021 ◽  
Author(s):  
Wenbo Liu ◽  
Junwei Zeng ◽  
Yixun Gao ◽  
Hao Li ◽  
Nicolaas Frans de Rooij ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Functional Groups ◽  
Room Temperature ◽  
Gas Sensing ◽  
Graphene Nanosheets ◽  
Dye Molecules ◽  
Transfer Enhancement

Special functional groups to modify the surface of graphene has received much attention since it enables the charge transfer enhancement, thus realizing the gas-sensing at room temperature. In this work,...

Near infrared and charge transfer luminescence of Yb 3+ -doped LaPO 4 at room temperature

2011 ◽  
Vol 46 (10) ◽  
pp. 1033-1037 ◽  
Author(s):  
M. Ferhi ◽  
K. Horchani-Naifer ◽  
S. Hraiech ◽  
M. Ferid ◽  
Y. Guyot ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Room Temperature ◽  
Near Infrared

scholarly journals Room temperature detection of individual molecular physisorption using suspended bilayer graphene

2016 ◽  
Vol 2 (4) ◽  
pp. e1501518 ◽  
Author(s):  
Jian Sun ◽  
Manoharan Muruganathan ◽  
Hiroshi Mizuta
Keyword(s):  
Charge Transfer ◽  
Electronic Transport ◽  
Density Functional ◽  
Room Temperature ◽  
Electrostatic Force ◽  
Bilayer Graphene ◽  
Resistance Response ◽  
Resistance Change ◽  
Back Gate ◽  
Temperature Detection

Detection of individual molecular adsorption, which represents the ultimate resolution of gas sensing, has rarely been realized with solid-state devices. So far, only a few studies have reported detection of individual adsorption by measuring the variation of electronic transport stemming from the charge transfer of adsorbate. We report room-temperature detection of the individual physisorption of carbon dioxide molecules with suspended bilayer graphene (BLG) based on a different mechanism. An electric field introduced by applying back-gate voltage is used to effectively enhance the adsorption rate. A unique device architecture is designed to induce tensile strain in the BLG to prevent its mechanical deflection onto the substrate by electrostatic force. Despite the negligible charge transfer from a single physisorbed molecule, it strongly affects the electronic transport in suspended BLG by inducing charged impurity, which can shut down part of the conduction of the BLG with Coulomb impurity scattering. Accordingly, we can detect each individual physisorption as a step-like resistance change with a quantized value in the BLG. We use density functional theory simulation to theoretically estimate the possible resistance response caused by Coulomb scattering of one adsorbed CO2 molecule, which is in agreement with our measurement.

scholarly journals Coupled Charge Transfer Dynamics and Photoluminescence Quenching in Monolayer MoS2 Decorated with WS2 Quantum Dots

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Larionette P. L. Mawlong ◽  
Abhilasha Bora ◽  
P. K. Giri
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Kelvin Probe ◽  
Photoluminescence Quenching ◽  
Force Microscopy ◽  
Level Model ◽  
Microscopy Analysis ◽  
Charge Transfer Dynamics

AbstractHerein, we have investigated the tunability of the photoluminescence (PL) of the monolayer MoS2 (1L-MoS2) by decorating it with WS2 quantum dots (WS2 QD). The direct bandgap 1L-MoS2 and WS2 QDs are grown by chemical vapor deposition and liquid exfoliation methods, respectively. The room temperature PL spectrum of bare 1L-MoS2 is systematically quenched with its decoration with WS2 QDs at different concentrations. A decrease in the work function of 1L-MoS2 with the decoration of WS2 QDs was established from the Kelvin probe force microscopy analysis. A detailed quantitative analysis using the four-energy level model involving coupled charge transfer was employed to explain the redshift and the systematic decrease in the intensity of the PL peak in 1L-MoS2/WS2 QD heterostructure. The modulation of the PL in the heterostructure is attributed to the increase in the formation of negative trions through the charge transfer from WS2 QD to the 1L-MoS2 and thus making the 1L-MoS2 heavily n-type doped, with increase in the electron density by ~1.5 × 1013 cm−2. This study establishes the contribution of defects in the coupled charge transfer dynamics in 1L-MoS2, and it lays out a convenient strategy to manipulate the optical and electrical properties of 1L-MoS2 for various optoelectronic applications.

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