Solvent-free, mechanochemical syntheses of bulk trihalide perovskites and their nanoparticles

2017 ◽  
Vol 53 (21) ◽  
pp. 3046-3049 ◽  
Author(s):  
Atanu Jana ◽  
Mona Mittal ◽  
Aayushi Singla ◽  
Sameer Sapra
Keyword(s):  
Solid State ◽  
Room Temperature ◽  
Solvent Free ◽  
Solid State Reactions ◽  
First Time

For the first time, we have synthesized APbBr3 (A = Cs+/MA+/FA+, where MA+ = CH3NH3+ and FA+ = CH(NH2)2+) bulk as well as nanoparticles (NPs) by solid-state reactions at room temperature.

Room Temperature Solvent-Free Synthesis of Monodisperse Magnetite Nanocrystals

2006 ◽  
Vol 6 (3) ◽  
pp. 852-856 ◽  
Author(s):  
X. R. Ye ◽  
C. Daraio ◽  
C. Wang ◽  
J. B. Talbot ◽  
S. Jin
Keyword(s):  
Oleic Acid ◽  
Solid State ◽  
Large Scale ◽  
Room Temperature ◽  
Solvent Free ◽  
Two Dimensional ◽  
New Process ◽  
High Boiling Point ◽  
Magnetite Nanocrystals ◽  
Solvent Free Synthesis

We have successfully demonstrated a facile, solvent-free synthesis of highly crystalline and monodisperse Fe3O4 nanocrystallites at ambient temperature avoiding any heating. Solid state reaction of inorganic Fe(II) and Fe(III) salts with NaOH was found to produce highly crystalline Fe3O4 nanoparticles. The reaction, if carried out in the presence of surfactant such as oleic acid–oleylamine adduct, generated monodisperse Fe3O4 nanocrystals extractable directly from the reaction mixture. The extracted nanoparticles were capable of forming self-assembled, two-dimensional and uniform periodic array. The new process utilizes inexpensive and nontoxic starting materials, and does not require a use of high boiling point and toxic solvents, thus is amenable to an environmentally desirable, large-scale synthesis of nanocrystals.

scholarly journals Visible-Light-Excited Room Temperature Phosphorescent Carbon Dots

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 464 ◽  
Author(s):  
Sizhe Hu ◽  
Kai Jiang ◽  
Yuci Wang ◽  
Sui Wang ◽  
Zhongjun Li ◽  
...  
Keyword(s):  
Solid State ◽  
Visible Light ◽  
Carbon Dots ◽  
Short Wavelength ◽  
Room Temperature ◽  
Uv Light ◽  
Long Wavelength ◽  
Heating Treatment ◽  
First Time ◽  
Matrix Free

Carbon dots (CDs) with a room temperature phosphorescent (RTP) feature have attracted considerable interest in recent years due to their fundamental importance and promising applications. However, the reported matrix-free RTP CDs only show short-wavelength (green to yellow) emissions and have to be triggered by ultraviolet (UV) light (below 400 nm), limiting their applications in certain fields. Herein, visible-light-excited matrix-free RTP CDs (named AA-CDs) with a long-wavelength (orange) emission are reported for the first time. The AA-CDs can be facilely prepared via a microwave heating treatment of L-aspartic acid (AA) in the presence of ammonia and they emit unique orange RTP in the solid state with visible light (420 nm) excitation just being switched off. Through the studies of the carbonization process, the C=O and C=N containing moieties in the AA-CDs are confirmed to be responsible for the observed RTP emission. Finally, the applications of AA-CDs in information encryption and anti-counterfeiting were preliminarily demonstrated.

Solid-state Synthesis of Aryl 2-Nitrophenyl Ureas

2003 ◽  
Vol 2003 (4) ◽  
pp. 220-221 ◽  
Author(s):  
Jing Li ◽  
Yu-lu Wang ◽  
Ting Sun
Keyword(s):  
Solid State ◽  
Room Temperature ◽  
Solid State Synthesis ◽  
First Time

A simple and efficient solid-state synthesis for aryl 2-nitrophenyl ureas at room temperature is described for the first time.

scholarly journals A novel dimethylformamide (DMF) free bar-cast method to deposit organolead perovskite thin films with improved stability

2016 ◽  
Vol 52 (23) ◽  
pp. 4301-4304 ◽  
Author(s):  
Eurig W. Jones ◽  
Peter J. Holliman ◽  
Arthur Connell ◽  
Matthew L. Davies ◽  
Jennifer Baker ◽  
...  
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Solvent Free ◽  
Solid State Reactions ◽  
Improved Stability

We report a solvent-free approach to synthesizing organolead perovskites by using solid state reactions to coat perovskite crystals onto Al2O3or TiO2nanoparticles followed by addition of terpineol affording perovskite inks.

Dry mechanochemical synthesis of alane from LiH and AlCl3

2014 ◽  
Vol 170 ◽  
pp. 137-153 ◽  
Author(s):  
Ihor Z. Hlova ◽  
Shalabh Gupta ◽  
Jennifer F. Goldston ◽  
Takeshi Kobayashi ◽  
Marek Pruski ◽  
...  
Keyword(s):  
Solid State ◽  
Room Temperature ◽  
Reaction Pathway ◽  
Milling Process ◽  
Solvent Free ◽  
Aluminium Chloride ◽  
Rational Approach ◽  
Starting Mixture ◽  
Free Process ◽  
Temperature Programmed

A mechanochemical process for the synthesis of alane (AlH3) starting from lithium hydride (LiH) and aluminium chloride (AlCl3) at room temperature and the underlying reaction pathway have been studied. In contrast to a conventional process using the same two reactants dissolved in diethyl ether, our approach enables a solvent-free synthesis, thereby directly leading to adduct-free alane. The method described here is quick and efficient, resulting in the quantitative conversion of all aluminium in the starting mixture to alane. Both the intermediate compounds formed during the reaction and the final products have been characterized by powder X-ray diffraction, solid-state27Al NMR spectroscopy, and temperature programmed desorption analysis of the as-milled mixtures. We show that excess LiH in the starting mixture (with an optimal ratio of 9LiH : 1AlCl3) is essential for the formation and stability of Al–H bonds, initially in the form of alanates and, eventually, as alane. Further processing of this mixture, gradually adding AlCl3to reach the ideal 3LiH : 1AlCl3stoichiometry, appears to restrict the local accumulation of AlCl3during the ball-milling process, thereby preventing the formation of unstable intermediates that decompose to metallic Al and molecular hydrogen. We also demonstrate that under the milling conditions used, a moderate hydrogen pressure ofca.300 bar is required to suppress competing reactions that lead to the formation of metallic Al at room temperature. The identification of the reaction intermediates at each stage of the synthesis provides significant insight into the mechanism of this solid-state reaction, which may potentially afford a more rational approach toward the production of AlH3in a simple solvent-free process.

Mechanochemical synthesis of two-dimensional aromatic polyamides

2017 ◽  
Vol 53 (54) ◽  
pp. 7481-7484 ◽  
Author(s):  
Yang Yang ◽  
Fanxing Bu ◽  
Jingjing Liu ◽  
Imran Shakir ◽  
Yuxi Xu
Keyword(s):  
Mechanochemical Synthesis ◽  
Room Temperature ◽  
Solvent Free ◽  
Two Dimensional ◽  
Aromatic Polyamides ◽  
Temperature Conditions ◽  
First Time

2D aromatic polyamides (2DAPAs) were synthesized for the first time via a facile mechanochemical route under solvent-free and room temperature conditions.

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