“In-Situ Raman Spectroscopy of Electronic Processes in Fullerene Thin Films

AbstractThe current voltage characteristics of C60 thin film sandwich structures fabricated by vacuum deposition on indium tin oxide (ITO) with an aluminium top electrode are presented and discussed. A strongly non-linear behavior and a sharp increase in the device conductivity was observed at relatively low voltages (∼2V), at both room and low temperatures (20K). At room temperature the system is seen to collapse, and in situ Raman measurements indicate a solid state reduction of the fullerene thin film to form a polymeric state. The high conductivity state was seen to be stable at elevated voltages and low temperatures. This state is seen to be reversible with the application of high voltages. At these high voltages the C60 film was seen to sporadically emit white light at randomly localized points analogous to the much documented Electroluminescence in single crystals.

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Study of the Redox Process of Poly(5‐amino‐1‐naphthol) Thin Film by In Situ Raman Spectroscopy

Journal of The Electrochemical Society ◽

10.1149/1.1836968 ◽

1996 ◽

Vol 143 (7) ◽

pp. 2116-2119 ◽

Cited By ~ 53

Author(s):

Malik Mostefai ◽

Minh‐Chau Pham ◽

Jean‐Pierre Marsault ◽

Jean Aubard ◽

Pierre‐Camille Lacaze

Keyword(s):

Thin Film ◽

Raman Spectroscopy ◽

Redox Process ◽

In Situ Raman Spectroscopy ◽

In Situ Raman

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In situ Raman spectroscopy of nanostructuration by surface plasmas generated on alumina thin film-silicon bilayers

Plasma Sources Science and Technology ◽

10.1088/1361-6595/ab2d81 ◽

2019 ◽

Vol 28 (8) ◽

pp. 085007 ◽

Cited By ~ 1

Author(s):

David Z Pai ◽

Frédéric Pailloux ◽

David Babonneau

Keyword(s):

Thin Film ◽

Raman Spectroscopy ◽

In Situ Raman Spectroscopy ◽

In Situ Raman ◽

Thin Film Silicon ◽

Alumina Thin Film ◽

Surface Plasmas

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An Experimental Study of the Formation of Talc through CaMg(CO3)2–SiO2–H2O Interaction at 100–200°C and Vapor-Saturation Pressures

Geofluids ◽

10.1155/2017/3942826 ◽

2017 ◽

Vol 2017 ◽

pp. 1-14 ◽

Cited By ~ 3

Author(s):

Ye Wan ◽

Xiaolin Wang ◽

I-Ming Chou ◽

Wenxuan Hu ◽

Yang Zhang ◽

...

Keyword(s):

Low Temperatures ◽

Fused Silica ◽

X Ray Diffraction ◽

In Situ Raman Spectroscopy ◽

X Ray ◽

In Situ Raman ◽

Geological Processes ◽

Partial Pressures ◽

Increasing Temperature

The metamorphic interaction between carbonate and silica-rich fluid is common in geological environments. The formation of talc from dolomite and silica-rich fluid occurs at low temperatures in the metamorphism of the CaO–MgO–SiO2–CO2–H2O system and plays important roles in the formation of economically viable talc deposits, the modification of dolomite reservoirs, and other geological processes. However, disagreement remains over the conditions of talc formation at low temperatures. In this study, in situ Raman spectroscopy, quenched scanning electron microscopy, micro-X-ray diffraction, and thermodynamic calculations were used to explore the interplay between dolomite and silica-rich fluids at relatively low temperatures in fused silica tubes. Results showed that talc formed at ≤200°C and low CO2partial pressures (PCO2). The reaction rate increased with increasing temperature and decreased with increasingPCO2. The major contributions of this study are as follows:(1)we confirmed the formation mechanism of Mg-carbonate-hosted talc deposits and proved that talc can form at ≤200°C;(2)the presence of talc in carbonate reservoirs can indicate the activity of silica-rich hydrothermal fluids; and (3) the reactivity and solubility of silica require further consideration, when a fused silica tube is used as the reactor in highP–Texperiments.

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