Ag2S Nanoparticles Evolved into Luminescent AgInS2@In2S3 Heteronanoparticles through Dual Formation Mechanism. (11th June 2022)

• Record Type: Journal Article
• Authors: Zhang, Yongliang; Chang, Cheng; Liu, Peifeng; Lei, Junyu; Cai, Jing
• Is Part Of: Particle and particle systems characterization. Volume 39:Number 7(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-11
• Subjects: Ag 2−3δInδS -- AgInS 2 -- In 2S 3 -- band‐edge emissions -- dual formation mechanisms; Particles -- Periodicals; 620.43
• DOI: 10.1002/ppsc.202200054
• Languages: English
• ISSNs: 0934-0866

Abstract

Abstract: A deep understanding of the growth kinetics and mechanism of metal sulfide nanostructure is helpful in preparing nanomaterials with controllable structures. This study reports a facile synthetic protocol for the luminescent AgInS2 @In2 S3 core@shell heteronanoparticles through the reaction of preformed Ag2 S nanoparticles with excess [(C4 H9 )2 NCS2 ]3 In in dodecanethiol. A dual formation mechanism for the orthorhombic AgInS2 ( o ‐AgInS2 ) component is proposed, that is, the cation exchange of partial Ag + in Ag2 S nanoparticle by In 3+ to produce the metastable AgInS2 and alloying of the In2 S3 formed through direct decomposition of [(C4 H9 )2 NCS2 ]3 In with Ag2 S nanoparticles to produce AgInS2 . Following the dual formation mechanism, the Ag2 S nanoparticle first evolves into the intermediate Ag 2−3δ In δ S/ o ‐AgInS2 Janus heteronanoparticle without band‐edge emission of o ‐AgInS2, then converts to the o ‐AgInS2 nanoparticle, and finally transforms to the o ‐AgInS2 @In2 S3 core@shell heteronanoparticle with band‐edge emission of o ‐AgInS2 . The appearance of band‐edge emission might be attributed to the removal of the surface defects of the o ‐AgInS2 core by coating the In2 S3 shell. This study would provide a facile protocol for the synthesis of IB‐IIIA‐VIA2 nanomaterials with controlled architecture and benefit the development of monochromatic luminescent apparatus. Abstract : Luminescent AgInS2 @In2 S3 core@shell nanoparticles are synthesized via the reaction of preformed Ag2 S nanoparticles with excess [(C4 H9 )2 NCS2 ]3 In in dodecanethiol. Following a dual formation mechanism including alloy and partial cation exchange routes, the Ag2 S nanoparticles would evolve into Ag2−3δ Inδ S/AgInS2 intermediate Janus heteronanoparticles and finally into AgInS2 @In2 S3 heteronanoparticles with band‐edge emission of AgInS2 core.