研究目的
To fabricate two-dimensional non-layered selenium nanoflakes using a simple liquid phase exfoliation method and apply them in a self-powered photodetector to evaluate their photoresponse performance and stability.
研究成果
The 2D Se nanoflakes fabricated by liquid phase exfoliation exhibit high photocurrent density and responsivity, good stability, and broad-spectrum photoresponse, demonstrating their potential for self-powered photodetectors in optoelectronics.
研究不足
The photocurrent intensities for specific wavelengths were weaker compared to simulated light, possibly due to lower light intensity. The method may require optimization for higher yield and stability in different environments.
1：Experimental Design and Method Selection:
A liquid phase exfoliation method was chosen to fabricate 2D Se nanoflakes from bulk Se due to its simplicity and effectiveness. The photoelectrochemical (PEC) method was used to measure photoresponse in a standard three-electrode system.
2：Sample Selection and Data Sources:
Bulk Se powder was used as the source material. Samples were characterized using TEM, AFM, XRD, and Raman techniques.
3：List of Experimental Equipment and Materials:
Equipment includes a sonic tip, bath sonicator, centrifuge, vacuum oven, TEM, AFM, XRD, Raman spectrometer, UV-Vis spectrophotometer, and PEC setup with ITO glass, platinum wire, and saturated calomel electrode. Materials include bulk Se powder, isopropanol (IPA), PVDF, DMF, KOH, and optical filters.
4：Experimental Procedures and Operational Workflow:
Bulk Se was sonicated in IPA, centrifuged to remove large particles, and the dispersion was dropped onto ITO glass to form the working electrode. PEC measurements were conducted with varying bias potentials, light intensities, and wavelengths.
5：Data Analysis Methods:
Photocurrent density and responsivity were calculated from I-t curves and LSV measurements. Band gap was determined from UV-Vis absorption spectra using Tauc plots.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容-
sonic tip
Used for sonication to exfoliate bulk Se powder in IPA.
-
bath sonicator
Used for additional sonication of the Se dispersion.
-
centrifuge
Used to remove large particles from the Se dispersion by centrifugation.
-
vacuum oven
Used to dry the Se nanoflakes precipitate.
-
transmission electron microscopy
TEM
Used to characterize the morphology and size of 2D Se nanoflakes.
-
atomic force microscopy
AFM
Used to measure the thickness of 2D Se nanoflakes.
-
X-ray diffraction
XRD
Used to analyze the crystalline phase of bulk Se and 2D Se.
-
Raman spectrometer
Used to confirm the crystal structures of bulk Se and 2D Se.
-
UV-Vis spectrophotometer
Used to obtain absorption spectra and calculate band gap.
-
photoelectrochemical setup
PEC
Used to measure photoresponse behavior with a three-electrode system.
-
indium-tin oxide conductor glass
ITO
Used as the substrate for the working electrode coated with Se nanoflakes.
-
platinum wire
Used as the counter electrode in the PEC system.
-
saturated calomel electrode
Used as the reference electrode in the PEC system.
-
optical filters
Used to obtain specific wavelengths of light for irradiation.
-
登录查看剩余12件设备及参数对照表
查看全部
