Synthesis of Cu-Ag@Ag particles using hyperbranched polyester as template

Han, Wei

doi:10.1007/s13391-015-5043-8

Cited by 6 publications

(8 citation statements)

References 24 publications

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“…Thus, the presence of HMTA in the synthesized nanorods is confirmed. It has been reported that when HMTA is used as a capping agent, it produces more OH− ions in the solution at certain reaction temperatures [50]. Therefore, we conclude that the HMTA played a key role in forming the nanorod morphology of the samples prepared in this work.…”

Section: Fourier Transform Infrared Spectroscopysupporting

confidence: 60%

“…The third loss stage which is most prominent for the Er/Nd co-doped sample and with exothermic peak at about 400 0 C is due to conversion from GdOOH to Gd2O3 [50]. The total weight loss of 14.46%, 14.88%, and 14.74% for Gd(OH)3, Gd(OH)3:Er0.02, and Gd(OH)3:Er0.02,Nd0.01 nanorods, respectively are in close agreement with the reported theoretical value (13.4%) for Gd(OH)3 [50]. The slight variation in the weight loss for the different samples could be a result of the dopant ions.…”

Section: Thermogravimetric (Tga) and Differential Thermal Analysis (Dta)mentioning

confidence: 97%

“…Stage 2 is the weight loss (with exothermic peak at about 288 0 C) attributed to a dehydration process and a complete conversion of the Gd(OH)3 phase to GdOOH phase [52]. The third loss stage which is most prominent for the Er/Nd co-doped sample and with exothermic peak at about 400 0 C is due to conversion from GdOOH to Gd2O3 [50]. The total weight loss of 14.46%, 14.88%, and 14.74% for Gd(OH)3, Gd(OH)3:Er0.02, and Gd(OH)3:Er0.02,Nd0.01 nanorods, respectively are in close agreement with the reported theoretical value (13.4%) for Gd(OH)3 [50].…”

Section: Thermogravimetric (Tga) and Differential Thermal Analysis (Dta)mentioning

confidence: 99%

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Photophysical Characterization of Er3+ doped and Er3+/Nd3+ co-doped Gd(OH)3 Nanocrystals: the Impact of Hexamethylenetetramine utilization for Morphology Engineering

Gbor,

Swart,

Reyes-Rojas

et al. 2024

Preprint

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This work is a study on the photophysical properties of Er3+ doped and Er3+/ Nd3+ co-doped Gd(OH)3 nanocrystals. It also demonstrated up-conversion luminescence quenching arising from utilization of hexamethylenetetramine (HMTA) for the formation of rod-like morphologies. The synthesis was carried out via the precipitation technique. TG/DTA results show Gd(OH)3 phase is formed and stabilized in the temperature range of 30 to 106o C. Fourier Transform Infrared spectroscopy results indicate the presence of OH functional group, a signature of core OH- of the Gd(OH)3 host as well as the HMTA. X-ray diffraction measurement show hexagonal structure. The average crystallite sizes range between 23 and 35 nm in an increasing trend with increasing Nd3+ concentrations. SEM micrographs showed nanorods only for samples treated with HMTA. The 800 nm transition line was enhanced in the diffuse reflectance measurements with increasing Nd content, suggesting that upconversion emission may be enhanced as well. As Nd3+ ion concentrations increased, the valence band and conduction band edges also showed lateral changes towards more negative values. The Gd(OH)3:Er0.02 nanocrystals (without HMTA) produced the strongest upconversion emission at 560, 660, 758 and 875 nm. The emission at 875 nm had a 10-fold enhancement over the other emission bands. The pair of emissions, 758 and 875 nm, are employed in luminescence thermometry. Thus, the results from this work demonstrated that the synthesized nanocrystals have the potential to be applied in photonic related applications such as photodynamic therapy and luminescence thermometry. No upconversion emission was recorded for Er3+, Nd3+ co-doped Gd(OH)3 nanorods due to prevalence of OH-group from the HMTA used.

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Section: Fourier Transform Infrared Spectroscopysupporting

confidence: 60%

Section: Thermogravimetric (Tga) and Differential Thermal Analysis (Dta)mentioning

confidence: 97%

Section: Thermogravimetric (Tga) and Differential Thermal Analysis (Dta)mentioning

confidence: 99%

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Photophysical Characterization of Er3+ doped and Er3+/Nd3+ co-doped Gd(OH)3 Nanocrystals: the Impact of Hexamethylenetetramine utilization for Morphology Engineering

Gbor,

Swart,

Reyes-Rojas

et al. 2024

Preprint

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“…In Table 1, the spherical Cu@Ag core–shell nanoparticles are compared with that of other similar nanomaterials [17–21]. The results indicate that our samples exhibit significantly electronic conductivity and thermal stability with low Ag content.…”

Section: Resultsmentioning

confidence: 99%

“…The resistivity of sample 3 with Ag content 7.68 wt% is five-order of magnitude lower than that of pure Cu at same annealed time [17]. In Table 1, the spherical Cu@Ag core-shell nanoparticles are compared with that of other similar nanomaterials [17][18][19][20][21]. The results indicate that our samples exhibit significantly electronic conductivity and thermal stability with low Ag content.…”

mentioning

confidence: 99%

One‐step synthesis of oxidation‐resistant Cu@Ag core–shell nanoparticles

Yao

Xia

Chen

et al. 2018

Micro & Nano Letters

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One-step synthesis of wet chemical method is proposed for the preparation of core-shell nanostructures of copper and silver. This facile and environment friendly fabrication simplifies the surface treatment of copper particles to avoid copper core to be oxidised before coating silver. The thermal stability against oxidation and electrical properties of Cu@Ag core-shell nanoparticles are investigated. The results show that Cu@Ag core-shell nanoparticles possess high spherical degree, and the silver is evenly coated on the surface of copper nanoparticles. The synthesised spherical Cu@Ag core-shell nanoparticles exhibit excellent thermal stability at the high temperature of 300°C. After annealing at 200°C for 30 min, the sheet resistance of the spherical Cu@Ag core-shell nanoparticles (Ag content 7.68 wt%) is extremely low (69.82 μΩ cm).

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