Single-step synthesis of silver sulfide nanocrystals in arsenic trisulfide

Abstract

Silver sulfide nanocrystals and chalcogenide glasses (ChGs) are two distinct classes of semiconductor materials that have been exploited for new infrared technologies. Each one exhibits particular optoelectronic phenomena, which could be encompassed in a hybrid material. However, the integration of uniformly distributed crystalline phases within an amorphous matrix is not always an easy task. In this paper, we report a single step method to produce Ag 2 S nanocrystals (NCs) in arsenic trisulfide (As 2 S 3) solution. The preparation is carried out at room temperature, using As 2 S 3 , AgCl and propylamine resulting in highly crystalline Ag 2 S nanoparticles in solution. These solutions are spin-coated on glass and silicon substrates to produce As 2 S 3 /Ag 2 S metamaterials for optoelectronics.

Laser‐Induced Formation of CdS Crystallites in Cd‐Doped Amorphous Arsenic Sulfide Thin Films

“…Recently a similar effect was observed in the Raman spectra of As 2 Se 3 :Cd films where the formation of CdSe crystallites under the laser irradiation was reported . Several studies in recent years were devoted to Ag 2 S nanocrystals and PbS/CdS core‐shell quantum dots prepared in amorphous As 2 S 3 by colloidal techniques.…”

“…To our knowledge, no studies of CdS crystallites formed in amorphous chalcogenide matrices have been reported so far. However, in recent years several studies were published regarding the formation of sulfide nanocrystals in amorphous As 2 S 3 by colloidal techniques, namely PbS/CdS core‐shell quantum dots and Ag 2 S nanocrystals . Besides, semiconductor nanocrystals formed in related amorphous chalcogenides were reported in another recent studies: CdSe in As 2 Se 3 :Cd films, Ga 2 Se 3 in As 30 Se 50 Te 20 glass, and PbS as well as CdSe/ZnS core‐shell structures in amorphous Ge–Sb–S …”

Solution phase driven As2S3 chalcogenide films: Optical and picosecond nonlinear optical properties

“…solution of As 2 S 3 and AgCl in amine solvent) which enhances the functional properties of prepared thin¯lms. 17,18 These merits clearly establish that solution phase chalcogenide glass processing o®ers several advantages for realizing optical components for the IR optics, particularly for mid-infrared waveguide development. 19 Arsenic tri-sul¯de (As 2 S 3 ) possesses easy synthesis route and also has an excellent photosensitivity.…”

Nonlinear optical waveguides in As_2S_3-Ag_2S chalcogenide glass thin films

“…Moreover, Ag 2 S nanocrystals present tunable emission in the near infrared and photocatalytic properties [10], which combined with the ChG can result in an advanced material for photonics. Recently, we demonstrated a simple method to fabricate thin films of glassy As 2 S 3 doped with Ag 2 S nanocrystals [11]. Nonetheless, for improving infrared technologies, it is essential to develop and characterize new materials as well as determine optimal processing for practical applications in all-optical systems.…”

“…In the present paper fs-pulses are used to study third-order optical nonlinearities and fabricate optical waveguides in ChGs containing semiconductor nanocrystals. Specifically, 500-nm films of As 2 S 3 and As 2 S 3 doped with Ag 2 S nanocrystals (As 2 S 3 :Ag 2 S-NCs) were produced from spin-coating the precursor solutions on glass substrates [11]. Because those films present low damage threshold, the nonlinear index of refraction was evaluated in the range of 775 -1600 nm using nonlinear ellipse rotation (NER) approach [14], which is a phase-sensitive method suitable for measuring such kind of sample.…”