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 Ag2S nanocrystals (NCs) in arsenic trisulfide (As2S3) solution. The preparation is carried out at room temperature, using As2S3, AgCl and propylamine resulting in highly crystalline Ag2S nanoparticles in solution. These solutions are spin-coated on glass and silicon substrates to produce As2S3/Ag2S metamaterials for optoelectronics.
Highlights
Semiconductor nanocrystals (NCs) and quantum dots are of great interest for their use in a wide range of applications from optoelectronics to biological systems [1, 2]
We report a one-step in situ synthesis of uniformly dispersed Ag2S nanocrystals in As2S3
In order to check for the formation of nanocrystals, transmission electron microscope (TEM) images are obtained from the diluted solution, as shown in Fig. 2(a) along with electron diffraction measurement
Summary
Semiconductor nanocrystals (NCs) and quantum dots are of great interest for their use in a wide range of applications from optoelectronics to biological systems [1, 2]. On account of the quantum confinement effect when synthetized at the nanometer scale, indirect transitions have been observed in the range of 0.9 – 1.8 eV and direct transitions are blue shifted, to the range 2.7 – 4.0 eV [7]. Based on these transitions, new applications have been proposed for silver sulfide, such as, NIR emitters for in vivo imaging [8, 9], sensitizers for solar cells [10], and substrates for surfaceenhanced Raman scattering (SERS) [11]. The reversible formation of metallic silver over Ag2S NCs when exposed to an electric field has enabled the development of atomic switching [12, 13], or optical switching materials [14]
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