Xi:Irritant;
7440-22-4Relevant articles and documents
Chemical vapor deposition of silver films for superconducting wire applications
Shapiro,Lackey,Haruigofsky,Hill,Carter,Barefield
, p. 331 - 349 (1992)
Chemical vapor deposition (CVD) was used to deposit silver films for superconducting wire applications. AgI, silver trifluoroacetate (Ag(TFA)), and perfluoro-1-methylpropenylsilver (Ag(PF)) produced the most promising silver films. CVD processing was optimized on these three precursors using thermodynamic calculations performed using a modified version of the SOLGASMIX-PV computer program. Ag(PF) produced the highest quality silver films at low temperatures and pressures. A fiber tow which contained a silver barrier layer and a YBa2Cu3Ox overlayer was found to be a superconductor at 72 K.
Crystalline roughness as a morphological characteristic of the surface of electroplated silver coatings
Bersirova,Kublanovskii
, p. 1944 - 1948 (2009)
Structure and morphology of electroplated silver coatings deposited from a borate-phosphate-carbonate electrolyte were studied in relation to the current density and temperature. Average values of the crystalline roughness were determined.
Trimethylphosphite stabilized N-silver(I) succinimide complexes as CVD precursors
Tao, Xian,Wang, Yu-Long,Shen, Ke-Cheng,Shen, Ying-Zhong
, p. 169 - 171 (2011)
The preparation of [(MeO)3Pn?AgNC 4H4O2] (n = 1, 2a; n = 2, 2b) is described. The molecular structure of 2a was determined by using X-ray single crystal analysis. Complex 2b was tested as Metal Organic Chemical Vapor Deposition (MOCVD) precursor in the deposition of silver for the first time. The thin films obtained were characterized using scanning electron microscopy (SEM) and energy-dispersion X-ray analysis (EDX). SEM and EDX studies show that the dense and homogeneous silver films could be obtained.
D-metal folates and the folic acid-imidazole conjugate
Skorik
, p. 1402 - 1406 (2015)
Metal folates MFol ? nH2O (M2+ = Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+; n = 4-6), silver folate Ag2Fol ? 3H2O, and the folic acid-imidazole conjugate H2Fol ? 3Im ? 2H2O were synthesized in aqueous solutions at a 1: 1 M2+: H2Fol molar ratio and pH 5.5-6.6. The compositions of the resulting compounds were determined by chemical, thermal, and gravimetric analysis. The composition of copper(II) folate was confirmed by elemental analysis; the solubility product of nickel folate (9.65 × 10-9) was estimated using solubility data. IR and electron absorption spectroscopy was used to show that oxygen atoms of carboxyl groups in folic acid and the pyridine nitrogen atom in imidazole are involved in bond formation in folates and the conjugate.
Preparation and optical properties of silica@Ag-Cu alloy core-shell composite colloids
Zhang, Jianhui,Liu, Huaiyong,Wang, Zhenlin,Ming, Naiben
, p. 1291 - 1297 (2007)
The silica@Ag-Cu alloy core-shell composite colloids have been successfully synthesized by an electroless plating approach to explore the possibility of modifying the plasmon resonance at the nanoshell surface by varying the metal nanoshell composition for the first time. The surface plasmon resonance of the composite colloids increases in intensity and shifts towards longer, then shorter wavelengths as the Cu/Ag ratio in the alloy shell is increased. The variations in intensity of the surface plasmon resonance with the Cu/Ag ratio obviously affect the Raman bands of the silica colloid core. The report here may supply a new technique to effectively modify the surface plasmon resonance.
Pulse radiolysis study of absorption spectra of Ag0 and Ag2+ in water from room temperature up to 380 °C
Mostafavi, Mehran,Lin, Mingzhang,Wu, Guozhong,Katsumura, Yosuke,Muroya, Yusa
, p. 3123 - 3127 (2002)
The reduction of silver ions by hydrated electrons is observed at different temperatures (from 25 to 300 °C) at 200 atm pressure in aqueous solutions and also in supercritical water (380 °C at 300 atm) using nanosecond pulse radiolysis techniques. An Arrh
Thermal and MS studies of silver(I) 2,2-dimethylbutyrate complexes with tertiary phosphines and their application for CVD of silver films
Szymańska,Piszczek,Szczesny,Sz?yk
, p. 2440 - 2448 (2007)
[Ag2(CH3CH2C(CH3)2COO)2] (1), [Ag2(CH3CH2C(CH3)2COO)2(PMe3)2] (2) and [Ag2(CH3CH2C(CH3)2COO)2(PEt3)2] (3) were prepared and characterized by MS-EI; 1H, 13C, 31P NMR, variable temperature IR (VT-IR) spectroscopy and thermal analysis. MS and VT-IR data analysis suggests bidentate bridging carboxylates and monodentately bonded phosphines in the solid phase. The same methods used for gas phase analysis of 1-2 proved [(CH3CH2C(CH3)2COO)Ag2]+ as the main ion, which could be transported in the gas phase during the CVD process. In the case of 3, similar intensity to the latter ion revealed [Ag{P(C2H5)}]+ and it is responsible for the CVD performance of 3. Thermal analysis results revealed that decomposition of 1-3 proceed in one endothermic process, with metallic silver formation between 197 and 220 °C. In the case of 1, VT-IR studies of the gaseous decomposition products demonstrate the presence of ester molecules and CO2, whereas for 2 the main gaseous product appeared to be acid anhydride. Therefore, 2 was not used as a silver CVD precursor. Metallic layers were produced from 3 in hot-wall CVD experiments, (between 200 and 280 °C), under a total reactor pressure of 2.0 mbar, using argon as a carrier gas. Thin films deposited on Si(1 1 1) substrate were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Silver films obtained at moderate temperature (220-250 °C) revealed a thickness below 50 nm, and were whitish colored and slightly matt.
Oscillatory circulation of copper particles during silver-displacement plating in a high magnetic field
Yonemochi, Shin-Ichi,Aogaki, Ryoichi
, p. 388 - 389 (2000)
Motion of copper particles during silver-displacement plating in a high magnetic field was investigated. Immediately after injecting a silver nitrate solution to a vessel filled with copper powder and suspending the powder in the solution, the particles start to circulate along a vessel under a vertical magnetic field with suddenly changing their directions. The velocity of the motion increased with the magnetic field strength though the deposition rate remained constant.
Thermal and chemical decomposition of di(pyrazine)silver(ii) peroxydisulfate and unusual crystal structure of a Ag(i) by-product
Leszczynski, Piotr J.,Budzianowski, Armand,Dobrzycki, Lukasz,Cyranski, Michal K.,Derzsi, Mariana,Grochala, Wojciech
, p. 396 - 402 (2012)
High purity samples of a [Ag(pyrazine)2]S2O 8 complex were obtained using modified synthetic pathways. Di(pyrazine)silver(ii) peroxydisulfate is sensitive to moisture forming [Ag(pyrazine)2](S2O8)(H2O) hydrate which degrades over time yielding HSO4- derivatives and releasing oxygen. One polymorphic form of pyrazinium hydrogensulfate, β-(pyrazineH+)(HSO4-), is found among the products of chemical decomposition together with unique [Ag(i)(pyrazine)] 5(H2O)2(HSO4)2[H(SO 4)2]. Chemical degradation of [Ag(pyrazine) 2]S2O8 in the presence of trace amounts of moisture can explain the very low yield of wet synthesis (11-15%). Attempts have failed to obtain a mixed valence Ag(ii)/Ag(i) pyrazine complex via partial chemical reduction of the [Ag(pyrazine)2]S2O8 precursor with a variety of inorganic and organic reducing agents, or via controlled thermal decomposition. Thermal degradation of [Ag(pyrazine) 2]S2O8 containing occluded water proceeds at T > 90 °C via evolution of O2; simultaneous release of pyrazine and SO3 is observed during the next stages of thermal decomposition (120-285 °C), while Ag2SO4 and Ag are obtained upon heating to 400-450 °C.
Encapsulation of Ag films on SiO2 by Ti reactions using Ag-Ti alloy/bilayer structures and an NH3 ambient
Alford,Adams, Daniel,Laursen,Manfred Ullrich
, p. 3251 - 3253 (1996)
Thin encapsulated silver films have been prepared on oxidized silicon by nitridation of ～200-nm-thick Ag-19 at.% Ti alloy films and Ag(120 nm)/Ti(22 nm) at 300-700°C in an ammonia ambient. The encapsulation process has been studied in detail by Rutherford
