Size-dependent solid-solid phase transition process of Ag2S nanoparticles

Recent Progresses on Structural Reconstruction of Nanosized Metal Catalysts via Controlled-Atmosphere Transmission Electron Microscopy: A Review

“… The phase stability of catalyst NPs is also related to the temperature. With the temperature change, the bulk phase or surface structure will undergo reconstruction. − The adsorption/desorption of a gas on the surface of the metal catalyst can be greatly affected by the temperature change of the system. Gas adsorption can directly alter the surface energy of the catalyst system and drive the reconstruction. − Many chemical processes are triggered by the energy provided by heating.…”

“…The phase stability of catalyst NPs is also related to the temperature. With the temperature change, the bulk phase or surface structure will undergo reconstruction. − …”

α-Ag2S nanoparticles: low-temperature syntheses, crystallisation pathway, and first operando luminescence measurements for sodium-ion battery applications

“…31,32 This approach allows for better control of the influence of reaction parameters, such as temperature, reaction time, precursor chemical composition, and reactant concentration on product formation. 33,34 Despite its fundamental importance, in situ studies of Ag 2 S have been limited to phase transformations on thin films and powder samples, [35][36][37][38][39] with no studies, to the best of our knowledge, on crystallisation processes in solutions.…”

Change in Rate of Catalytic Growths of Nanocrystals Catalyst for Formation of Asymmetric Multicomponent Heterostructures and Their Self-Assembly

“…Nanomaterials acting as catalyst for facilitating growths of other nanomaterials have opened up a new approach for architecting dual and triple material heterostructures. − Among these, silver chalcogenides remained in the forefront for solution processed growths of different groups II–VI semiconductor nanostructures. ,− These silver chalcogenides have unique characteristic which showed temperature dependent phase transitions from α to β form. ,− At higher temperature, the obtained cubic (or β) phase allows movements of Ag­(+) ions within the lattice, creating vacancies. This provided a new opportunity for insertion of other metal ions and facilitated superionic type catalytic growth leading to semiconductor–semiconductor heterostructures.…”

“…Even such types of secondary growth on silver chalcogenides are widely established, but the physical insights of their mechanism was reported in 2013 . Soon after, several such structures using Ag 2 S and Ag 2 Se as catalysts were developed, and even step growths leading to multisegments of semiconductor-heterostructures were formed. − ,,− ,− One of the key advantages of this approach is obtaining zinc-blende nanorods or nanowires which were typically obtained in wurtzite phase from direct colloidal synthesis protocols. − …”