Spontaneous formation of branched nanochains from room temperature molten amides: visible and near-IR active, SERS substrates for non-fluorescent and fluorescent analytes

RSC Advances ◽  
2013 ◽  
Vol 3 (22) ◽  
pp. 8356 ◽  
Author(s):  
K. L. Nagashree ◽  
R. Lavanya ◽  
C. Kavitha ◽  
N. S. Venkata Narayanan ◽  
Srinivasan Sampath
Keyword(s):  
Room Temperature ◽  
Sers Substrates ◽  
Spontaneous Formation ◽  
Near Ir

scholarly journals Absorption and Emission Spectra for C60 Anions

1994 ◽  
Vol 14 (1-3) ◽  
pp. 155-160 ◽  
Author(s):  
Tatsuhisa Kato
Keyword(s):  
Absorption Spectrum ◽  
Absorption Band ◽  
Theoretical Analysis ◽  
Room Temperature ◽  
Emission Spectra ◽  
Mirror Image ◽  
Ir Absorption ◽  
Near Ir ◽  
Laser Experiments ◽  
Ir Bands

Absorption spectra are detected for C60− and C602− produced electrolytically in solution at room temperature. Theoretical analysis of the spectrum of C60− by CNDO/S calculations gives an interpretation of the characteristic near-IR bands, the weak visible bands, and the strong bands in the UV region. The emission spectrum of C60− is a mirror image of the near-IR absorption band, and the detection of the emission reconfirms our original assignment of the absorption spectrum. The nature of the spectrum of C602− is characterized by a similar orbital picture to that of C60−. Further laser experiments of significance are proposed.

Identification of Nd163 phase in melt-textured NdBa2Cu3O7−δ bulk samples

2003 ◽  
Vol 18 (9) ◽  
pp. 2050-2054 ◽  
Author(s):  
Marcello Gombos ◽  
Vicente Gomis ◽  
Anna Esther Carrillo ◽  
Antonio Vecchione ◽  
Sandro Pace ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Optical Microscopy ◽  
Room Temperature ◽  
Polarized Light ◽  
Energy Dispersive ◽  
X Ray ◽  
Spontaneous Formation ◽  
The Stability ◽  
Scanning Electron

In this work, we report on the observation of Nd1Ba6Cu3O10,5 (Nd163) phase of the NdBaCuO system in melt-textured Nd123 bulk samples grown from a mixture of Nd123 and Nd210 phase powders. The observation was performed with polarized light optical microscopy and scanning electron microscopy–energy dispersive x-ray analyses. Images of the identified phase crystals show an aspect quite different from Nd422 crystals. Unexpectedly, Nd163 was individuated, even in “pure” Nd123 samples. Moreover, after long exposure to air, Nd163 disappeared completely in samples synthesized from powders containing Nd210. Thermogravimetry analyses of powders show that the stability of this phase in air is limited to temperatures higher than 900 °C, so Nd163 is unstable and highly reactive at room temperature. Moreover, an explanation of the observation of Nd163 in Nd210 free samples, based on the spontaneous formation of Nd163 phase in a Nd123 melt, is proposed.

Room-temperature near IR fluorescence of high optical quality KTP

2007 ◽  
Author(s):  
S. M. Hegde ◽  
K. L. Schepler ◽  
R. D. Peterson ◽  
D. E. Zelmon
Keyword(s):  
Room Temperature ◽  
Optical Quality ◽  
High Optical Quality ◽  
Near Ir

Photosensitive Amorphous Si Thin Films Prepared by Magnetron Technology.

2002 ◽  
Vol 744 ◽  
Author(s):  
Galina Khlyap ◽  
Victor Brytan
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Continuous Mode ◽  
Applied Bias ◽  
Near Ir ◽  
Current Voltage ◽  
Exponential Character ◽  
Current Voltage Characteristics ◽  
Amorphous Si ◽  
Spectral Ranges

ABSTRACTElectric field – induced effects are studied in thin films of amorphous Si grown by magnetron sputtering performed in continuous and pulse modes. Current-voltage characteristics are measured under the room temperature in different spectral ranges. It is shown that the investigated dependencies are of exponential character in all range of applied bias. Good photosensitivity was revealed by the samples prepared in continuous mode in the near-IR and visible interval. The samples grown by the pulse magnetron technology were shown room-temperature photosensitivity in near-IR range after 2000C hydrogenation.

Solid-State Infrared Photoacoustic Spectra of Group 6B Metal Mixed Carbonyl-t-Butylisocyanide Complexes, M(CO)6-n(CNtBu)n(M = Cr, Mo, W; n = 1–3)

1993 ◽  
Vol 47 (2) ◽  
pp. 218-221 ◽  
Author(s):  
Hongqi Li ◽  
Ian S. Butler
Keyword(s):  
Solid State ◽  
Room Temperature ◽  
Organometallic Complexes ◽  
Vibrational Assignments ◽  
Photoacoustic Spectra ◽  
Near Ir

Solid-state mid- and near-IR photoacoustic (PA) spectra have been measured at room temperature for the group 6B metal(0) mixed carbonyl- t-butylisocyanide complexes M(CO)6- n(CN tBu) n ( M = Cr, Mo, W; n = 1-3). Vibrational assignments are proposed for many of the observed bands. The PA spectra in the near-IR region (4600-3600 cm−1), where the binary v(CN) and v(CO) overtones and combinations absorb, are useful spectral fingerprints for these organometallic complexes.

Room temperature Near-IR photoluminescence from ethylenediamine assisted solvo-hydrothermally grown wurtzite ZnS:Nd2O3 system

2021 ◽  
Vol 257 ◽  
pp. 123713
Author(s):  
P. Sajan ◽  
C.K. Krishna Sagar ◽  
N.G. Divya ◽  
G. Subodh ◽  
M. Junaid Bushiri
Keyword(s):  
Room Temperature ◽  
Near Ir

scholarly journals Unified and practical access to ɤ-alkynylated carbonyl derivatives via streamlined assembly at room temperature

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Xu-Lu Lv ◽  
Wei Shu
Keyword(s):  
Carbonyl Group ◽  
Room Temperature ◽  
Functional Group ◽  
Spontaneous Formation ◽  
Carbonyl Derivatives ◽  
Unified Protocol ◽  
Straightforward Method ◽  
Directing Group

Abstract The development of a unified and straightforward method for the synthesis of ɤ-alkynylated ketones, esters, and amides is an unmet challenge. Here we report a general and practical protocol to access ɤ-alkynylated esters, ketones, and amides with diverse substitution patterns enabled by dual-catalyzed spontaneous formation of Csp3–sp3 and Csp3–sp bond from alkenes at room temperature. This directing-group-free strategy is operationally simple, and allows for the straightforward introduction of an alkynyl group onto ɤ-position of carbonyl group along with the streamlined skeleton assembly, providing a unified protocol to synthesize various ɤ-alkynylated esters, acids, amides, ketones, and aldehydes, from readily available starting materials with excellent functional group compatibility.

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