Rich Capping Ligand–Ag Colloid Interactions

2015 ◽  
Vol 119 (49) ◽  
pp. 27588-27593 ◽  
Author(s):  
Muqing Ren ◽  
Yuekang Jin ◽  
Wentian Chen ◽  
Weixin Huang
Keyword(s):  
Colloid Interactions ◽  
Ag Colloid

Surface-Enhanced Resonance Raman Spectra Study of α,β,γ,δ-Tetra-(4-Trimethyl Ammonium Phenyl) Porphyrin

1993 ◽  
Vol 47 (3) ◽  
pp. 292-295 ◽  
Author(s):  
Jian Chen ◽  
Ji-Ming Hu ◽  
Zhi-San Xu ◽  
Rong-Sheng Sheng
Keyword(s):  
Group Theory ◽  
Phenyl Ring ◽  
Resonance Raman ◽  
Vibrational Modes ◽  
Molecular Symmetry ◽  
Resonance Raman Scattering ◽  
Porphyrin Macrocycle ◽  
Surface Enhanced ◽  
Ag Colloid ◽  
Resonance Raman Spectra

In the present study, surface-enhanced resonance Raman scattering (SERRS) spectra of α,β,γ,δ-tetra-(4-trimethyl ammonium phenyl) porphyrin [T(4-TAP)P] were obtained. With increasing pH, the relative intensities of the bands at 890 and 1244 cm−1 decreased. These bands were attributed to γ(C-H) and δ(Cm-phenyl), respectively. The bands at 420 and 576 cm−1, which were assigned to γ(phenyl-ring), were enhanced. The molecular symmetry of T(4-TAP)P is discussed in terms of group theory. The bands at 1554 and 1496 cm−1 could be attributed to the vibrational modes of the porphyrin macrocycle; the bands at 1460, 1362, and 1330 cm−1 were assigned to ν(C-C) + δ(C-H), ν(C-N) + δ(C-H), and ν(C-N), respectively. All these bands change in band intensities, positions and widths, with the potential changing from +0.2 V to −0.2 V. It was concluded that the adsorbed porphyrins underwent partial incorporation with Ag from the electrode, and the adsorbate assumed a flat orientation on the silver electrode as well as the Ag colloid surface.

Characteristic Analysis and Electrical Conductivity of Graphene and Graphene-Nanosilver Prepared by Electrical Spark Discharge Method

2021 ◽  
Author(s):  
Kuo-Hsiung Tseng ◽  
Chu-Ti Yeh ◽  
Hsueh-Chien Ku ◽  
Der-Chi Tien ◽  
Leszek Stobinski
Keyword(s):  
Sheet Resistance ◽  
Spark Discharge ◽  
High Dispersion ◽  
Raman Signal ◽  
Characteristic Analysis ◽  
Graphene Layers ◽  
Ag Colloid ◽  
Xrd Patterns ◽  
Discharge Method ◽  
Electrical Spark Discharge Method

Abstract This study used an electric discharge machine (EDM) to perform the electrical spark discharge method (ESDM) to prepare a graphene colloid and a graphene-Ag colloid. The characteristic wavelengths of graphene, and graphene-Ag are both 262 nm. They had the properties of high dispersion and are unlikely to aggregate. The XRD patterns of graphene and graphene-Ag are typical carbon diffraction peak angles and crystal orientations. Graphene-Ag in DW can increase the Raman signal intensity of graphene. Regarding the graphene colloid and graphene-Ag colloid, their average sheet resistance values are 0.0329 MΩ/sq and 0.00136 MΩ/sq, respectively. Moreover, when AgNPs composited with graphene layers, the average sheet resistance is only 1/24 that of graphene layers, indicating that graphene-Ag has superior conductivity.

Preparation and Characterization of Ag Colloid Monolayers

Langmuir ◽  
1998 ◽  
Vol 14 (20) ◽  
pp. 5695-5701 ◽  
Author(s):  
Robin M. Bright ◽  
Michael D. Musick ◽  
Michael J. Natan
Keyword(s):  
Ag Colloid

Characterization and nonlinear optical properties of PVP/TiO2 nano-fibers doping with Ag colloid nano-particles

2013 ◽  
Vol 48 ◽  
pp. 124-127 ◽  
Author(s):  
M.H. Majles Ara ◽  
H. Naderi ◽  
A. Mobasheri ◽  
M.H. Rajabi ◽  
R. Malekfar ◽  
...  
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Nano Particles ◽  
Ag Colloid
Sign in / Sign up

Export Citation Format

Share Document