Insights into the effects of metal nanostructuring and oxidation on the work function and charge transfer of metal/graphene hybrids

Nanoscale ◽  
2015 ◽  
Vol 7 (30) ◽  
pp. 12868-12877 ◽  
Author(s):  
M. M. Giangregorio ◽  
W. Jiao ◽  
G. V. Bianco ◽  
P. Capezzuto ◽  
A. S. Brown ◽  
...  
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Charge Transfer ◽  
Work Function ◽  
Spectroscopic Ellipsometry ◽  
Cvd Graphene ◽  
Non Invasive

Charge transfer between CVD graphene and thin films and nanoparticles of various sizes of Al, Ga, Au, Cu and Ag was probed by various corroborating non-invasive approaches of KPFM, Raman spectroscopy and plasmonic spectroscopic ellipsometry.

Non-enzymatic glucose sensing by enhanced Raman spectroscopy on flexible ‘as-grown’ CVD graphene

The Analyst ◽  
2015 ◽  
Vol 140 (12) ◽  
pp. 3935-3941 ◽  
Author(s):  
Surojit Chattopadhyay ◽  
Mau-Shiun Li ◽  
Pradip Kumar Roy ◽  
C. T. Wu
Keyword(s):  
Raman Spectroscopy ◽  
Charge Transfer ◽  
Glucose Sensing ◽  
Cvd Graphene ◽  
Layer Graphene ◽  
A Charge ◽  
Few Layer Graphene

Unmodified, as-grown few layer graphene (on copper) have been used for glucose sensing using Raman spectroscopy. The origin of the graphene enhanced Raman spectroscopy (GERS) signal of glucose is attributed to a charge transfer from glucose to graphene.

scholarly journals Evaluation of Crystalline Volume Fraction of Laser-Annealed Polysilicon Thin Films Using Raman Spectroscopy and Spectroscopic Ellipsometry

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 999
Author(s):  
Jeongsang Pyo ◽  
Bohae Lee ◽  
Han-Youl Ryu
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Spectroscopic Ellipsometry ◽  
Laser Annealing ◽  
Continuous Wave ◽  
Volume Fraction ◽  
Three Dimensional ◽  
Green Laser ◽  
Blue Laser ◽  
Good Crystallinity

We investigated the crystallinities of poly silicon (poly Si) annealed via green laser annealing (GLA) with a 532-nm pulsed laser and blue laser annealing (BLA) with 450-nm continuous-wave lasers. Three-dimensional heat transfer simulations were performed to obtain the temperature distributions in an amorphous silicon (a-Si) thin film, and GLA and BLA experiments were conducted based on the thermal simulation results. The crystallinity of annealed poly Si samples was analyzed using Raman spectroscopy and spectroscopic ellipsometry. To evaluate the degree of crystallization for the annealed samples quantitatively, the measured spectra of laser-annealed poly Si were fitted to those of crystalline Si and a-Si, and the crystal volume fraction (fc) of the annealed poly Si sample was determined. Both the Raman spectroscopy and ellipsometry showed consistent results on fc. The fc values were found to reach >85% for optimum laser power of GLA and BLA, showing good crystallinity of the laser-annealed poly Si thin films comparable to thermal furnace annealing.

scholarly journals Controlling the electronic and physical coupling on dielectric thin films

2020 ◽  
Vol 11 ◽  
pp. 1492-1503
Author(s):  
Philipp Hurdax ◽  
Michael Hollerer ◽  
Larissa Egger ◽  
Georg Koller ◽  
Xiaosheng Yang ◽  
...  
Keyword(s):  
Thin Films ◽  
Charge Transfer ◽  
Work Function ◽  
Electron Tunneling ◽  
Metal Substrate ◽  
Electronic Coupling ◽  
Dielectric Thin Films ◽  
Fermi Level Pinning ◽  
Insulating Films ◽  
Adsorbate Layer

Ultrathin dielectric/insulating films on metals are often used as decoupling layers to allow for the study of the electronic properties of adsorbed molecules without electronic interference from the underlying metal substrate. However, the presence of such decoupling layers may effectively change the electron donating properties of the substrate, for example, by lowering its work function and thus enhancing the charging of the molecular adsorbate layer through electron tunneling. Here, an experimental study of the charging of para-sexiphenyl (6P) on ultrathin MgO(100) films supported on Ag(100) is reported. By deliberately changing the work function of the MgO(100)/Ag(100) system, it is shown that the charge transfer (electronic coupling) into the 6P molecules can be controlled, and 6P monolayers with uncharged molecules (Schottky–Mott regime) and charged and uncharged molecules (Fermi level pinning regime) can be obtained. Furthermore, it was found that charge transfer and temperature strongly influence the orientation, conformation, and wetting behavior (physical coupling) of the 6P layers on the MgO(100) thin films.

Raman spectra of charge transfer organic compounds: Conductors And Semiconductors

1995 ◽  
Vol 413 ◽  
Author(s):  
R. Gómez ◽  
R. Ridaura ◽  
M. Quintana ◽  
M. L. Marquina ◽  
V. Marquina ◽  
...  
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Charge Transfer ◽  
Raman Spectra ◽  
Coordination Compounds ◽  
Room Temperature ◽  
Molecular Solids ◽  
Donor And Acceptor ◽  
Ft Ir ◽  
Degree Of Charge Transfer

ABSTRACTA series of coordination compounds -macrocycle tetraaza derivatives with extended electronic conjugations- as molecular solids have been synthesized and analyzed by Raman spectroscopy. Their resistivity vs. temperature characteristics, measured in thin films, show three types of behavior: metallic, semiconductor and, in some cases, semiconductor with a transition to metallic below certain temperature. Room temperature Raman spectra were obtained in a FT-IR spectrometer and some stretching modes show different Raman shifts depending on the reactants. We relate these shifts with the degree of charge transfer between donor and acceptor radicals.

scholarly journals What can Raman spectroscopy and spectroscopic ellipsometry bring for the characterisation of thin films and materials surface?

2008 ◽  
Vol 40 (3-4) ◽  
pp. 588-592 ◽  
Author(s):  
Renata Lewandowska ◽  
Mélanie Gaillet ◽  
Gwénaëlle Le Bourdon ◽  
Céline Eypert ◽  
Sophie Morel ◽  
...  
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Spectroscopic Ellipsometry
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