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By LZH | 03 August 2023 | 0 Comments

Bi2S3 of metal chalcogenides

What is Bi2S3?
To evaluate the sensitivity of the Bi2S3 nanoflowers concerning changes in delivered dose, the time-averaged photoresponse of the nanoflowers was plotted as a function of relative dose (D-1/4, D-1/2, D-3/4, and D-1 normalized to D-1 respectively where D-1 is indicative of maximum dose delivered because of the least distance of the x-ray source from the sample). A fairly linear relationship between the photocurrents from the nanoflowers and the relative dose delivered. The photoresponse of the nanoflowers increased by about 241% for both 20 and 30 kV when the dose was increased by four times the minimum value (i.e., maximum FSD of 30.4 cm from the sample). The signal from the Bi2S3 nanoflowers shows a dose-dependent behavior, i.e., the photocurrent increased linearly with an increase in the x-ray. The overall photosensitivity of the Bi2S3 nanoflowers had a trend similar to the measurements obtained from the micro-ionization chamber. The photocurrent at 30 kV for the maximum dose was found to vary the most, with a standard deviation of 91 pA, compared to those at other doses and energies.

Bi2S3 of metal chalcogenides
One dimensional (1-D) nanostructures of metal chalcogenides, especially those of Bi2S3, are among the most widely studied. Bi2S3 is an n-type crystalline semiconductor with direct bandgap in the range of 1.3–1.7 eV1,2,3 Several studies have reported interesting morphologies of Bi2S3 in the form of nanoparticles, nanorods, nanotubes, nanowires, nanoflakes and nanoflowers1,4,5,6,7,8,9. These 1-D nanostructures of Bi2S3 have been reported to exhibit enhanced electrical, thermal and optoelectronic properties and thereby are extensively investigated for a variety of applications such as photovoltaics, thermoelectrics, infrared spectroscopy and field emission8,9. In a recent study, polymer-coated Bi2S3 nanoparticles were used for in vivo x-ray imaging applications as contrast agents in x-ray computed tomography10. The nanoparticles showed significantly higher x-ray absorption (five-folds) in comparison to the conventional iodinated contrast agents. The relatively high effective atomic-number (Z) of Bi2S3 allows it to undergo photoelectric interaction with a wide range of x-ray energies, making it a suitable material for clinical x-ray dosimetry. Subsequently, there is a growing interest to use bismuth-based materials for high-energy dosimetric applications.

Synthesis of Bi2S3 nanostructures
In the context of synthesis of Bi2S3 nanostructures, solvothermal or hydrothermal method is one of the most commonly used solution-based processes. The hydrothermal technique allows control over the morphology by varying reaction parameters such as reaction time, temperature, precursors and soft templates (surfactants, complexing agents, biomolecules9,29 or polymers)30. In this study, Bi2S3 nanostructures were synthesized through the hydrothermal process using polyethylene glycol (PEG) as a template to obtain flower-like nanostructures. To the best of our knowledge, this is the first study to report the x-ray photoresponse of the nanoflower-like structures of Bi2S3. The photoelectric response of micron-sized Bi2S3 units of “flowers” with “petals” of nanorods were measured under low x-ray energies, 20 to 30 kV, typically used in mammographic tomosynthesis. The nanoflowers were found to be extremely sensitive to the low x-ray energies at bias voltages as low as 0.2 V. The photocurrents, at 30 kV, were found to be ~3 times higher than the dark current values at all three bias voltages employed in this study. The photoresponse curves were stable and repeatable at different doses, exposure time and field sizes for all of the x-ray tube-potentials (20 to 30 kV). High sensitivity to low-energy x-rays along with other results suggests that the flower-like nanostructure of Bi2S3 is a potential material for use in semiconductor-based x-ray detection systems.

Price of Bi2S3
Bi2S3 particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Bi2S3. A large amount of large amount will be lower. The Price of Bi2S3 is on our company's official website.

Bi2S3 supplier
Luoyang Tongrun Nano Technology Co. Ltd.  (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including Bi2S3, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective Bi2S3, you are welcome to contact us or inquire at any time.

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