Aqueous germanate ion solution promoted synthesis of worm-like crystallized Ge nanostructures under ambient conditions

Chen, Jing; Zang, Xiaodan; Bai, Wei; Chu, Junhao; Liu, Aiyun

doi:10.1088/0957-4484/21/10/109801

Cited by 7 publications

(3 citation statements)

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“…It also has a bulk band gap of 0.67 eV at 300 K (Si E g = 1.11 eV at 300 K), which can be tuned through size control due to quantum confinement effects. 6 A variety of methods to prepare colloidal Ge NPs have been studied, including the thermal decomposition of organogermane single-source precursors, 7 metathesis of Ge Zintl phases, 8−11 reduction of Ge halides using mild to strong reductants, 4,12−14 reduction of GeO 2 powders, 15,16 and microwave-assisted reduction of GeI 2 in organic media. 17 These methods involve high temperatures and pressures, 18 intricate or time-consuming Ge precursor syntheses, 10,11 and pyrophoric or flammable reducing agents.…”

Section: ■ Introductionmentioning

confidence: 99%

Solvent Effects on Growth, Crystallinity, and Surface Bonding of Ge Nanoparticles

et al. 2018

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Solvent effects on the microwave-assisted synthesis of germanium nanoparticles are presented. A mixture of oleylamine and 1-dodecene was used as the reaction solvent. Oleylamine serves as a reducing agent in the synthesis while both molecules act as binding ligands. Increased concentrations of 1-dodecene in the solvent mixture were found to increase the size of the formed nanoparticles. Crystallinity was also dependent on the solvent mixture. Amorphous nanoparticles were obtained at lower 1-dodecene concentrations, whereas, at higher concentrations, particles contained crystalline and amorphous domains. 11-Methoxyundec-1-ene was synthesized to replace 1-dodecene in the reaction mixture for nuclear magnetic resonance (NMR) studies. H NMR of the reaction products shows that both solvent molecules in the system act as binding ligands on the nanoparticle surface. Nanoparticles were characterized using powder X-ray diffraction, scanning transmission electron microscopy, and spectroscopy techniques (Raman, UV-vis, FT-IR, and NMR).

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Section: ■ Introductionmentioning

confidence: 99%

Solvent Effects on Growth, Crystallinity, and Surface Bonding of Ge Nanoparticles

et al. 2018

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“…In this method, colloidal AuNRs were prepared by adding the Au seeds into an Au + growth solution, reduced from Au 3+ by ascorbic acid (AA), in the presence of a soft‐template (cetyltrimethylammonium bromide, CTAB). Many modifications of this two‐step recipe have been carried out, to produce AuNRs with higher monodispersity and improved tunability of the LSPR; they can be classified into two general categories: 1) Regulation of growth kinetics, including adjusting pH, temperature, and using an alternative reducing agent (e.g., hydroquinone (HQ), dopamine, etc. ); 2) Modification of the CTAB template using Hofmeister salts, aromatic additives, gemini, or binary surfactant, etc.…”

Section: Introductionmentioning

confidence: 99%

Seedless Synthesis of Monodispersed Gold Nanorods with Remarkably High Yield: Synergistic Effect of Template Modification and Growth Kinetics Regulation

Liu

Zheng

et al. 2017

Chemistry A European J

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Gold nanorods (AuNRs) are versatile materials due to their broadly tunable optical properties associated with their anisotropic feature. Conventional seed-mediated synthesis is, however, not only limited by the operational complexity and over-sensitivity towards subtle changes of experimental conditions but also suffers from low yield (≈15 %). A facile seedless method is reported to overcome these challenges. Monodispersed AuNRs with high yield (≈100 %) and highly adjustable longitudinal surface plasmon resonance (LSPR) are reproducibly synthesized. The parameters that influence the AuNRs growth were thoroughly investigated in terms of growth kinetics and soft-template regulation, offering a better understanding of the template-based mechanism. The facile synthesis, broad tunability of LSRP, high reproducibility, high yield, and ease of scale-up make this method promising for the future mass production of monodispersed AuNRs for applications in catalysis, sensing, and biomedicine.

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“…The formation of the alloy nanowires was proposed to be mostly driven by the interplay between the binding energy of the capping agents on alloy surfaces and the diffusion of atoms at the interface after the collision of primary nanoparticles. Wormlike Ge-nanostructures (of diameters in the range of 10−80 nm and lengths up to 1000 nm) can be directly prepared in an aqueous medium under ambient conditions by using widely available GeO 2 (in the form of germanate ions) as a precursor and NaBH 4 in a 24-h reaction . This route may be a good candidate for the synthesis of a wide variety of crystallized Ge-nanomaterials and devices due to its low cost, low risk, facileness, high yield (>70% and in gram scale), and convenience for adding other chemicals (namely, dopants or morphology-modifying agents) into the reaction system.…”

Section: Introductionmentioning

confidence: 99%

Nanostructures with Animal-like Shapes

Kharisov

Kharissova

José‐Yacamán

2010

Ind. Eng. Chem. Res.

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Rare nanostructures having shapes of animals are discussed in detail. Nanoforms, such as nanolarvae, nanoworms, nanosquamae, and nanourchins, of mainly inorganic compounds are examined. These nanostructures possess numerous useful properties (such as magnetic, semiconducting, and field-emitting properties) and applications, including mainly catalytic processes (in particular, for photodegradation of organic compounds); creation of nano/biomaterials and solar cells; and treatment of tumors, among other uses. A nonformal classification for nanostructures based on rare nanostructures is offered.

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Aqueous germanate ion solution promoted synthesis of worm-like crystallized Ge nanostructures under ambient conditions

Abstract: The full text of this article is available in the pdf provided.

Cited by 7 publications

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Solvent Effects on Growth, Crystallinity, and Surface Bonding of Ge Nanoparticles

Solvent Effects on Growth, Crystallinity, and Surface Bonding of Ge Nanoparticles

Seedless Synthesis of Monodispersed Gold Nanorods with Remarkably High Yield: Synergistic Effect of Template Modification and Growth Kinetics Regulation

Nanostructures with Animal-like Shapes

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