Controllable Preparation of CdS@PbS Core/Shell Quantum Dots via Cation Exchange and Their Near-Infrared Photodetector

doi:10.19894/j.issn.1000-0518.250035

Chinese Journal of Applied Chemistry ›› 2025, Vol. 42 ›› Issue (8): 1078-1086.DOI: 10.19894/j.issn.1000-0518.250035

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Controllable Preparation of CdS@PbS Core/Shell Quantum Dots via Cation Exchange and Their Near-Infrared Photodetector

Xiao-Li LI, Yan-Li LI, Dong LI()

Technology Innovation Center of Nanosized Natural Products and New Materials of Hebei Province，Heber Center for New Inorganic Optoelectronic Nanomaterial Research，School of Chemical Engineering and Materials，Handan University，Handan 056005，China

Received:2025-01-19 Accepted:2025-06-04 Published:2025-08-01 Online:2025-08-11
Contact: Dong LI
About author:lidong@bit.edu.cn
Supported by:
the National Natural Science Foundation of China(22171062);the Natural Science Foundation of Hebei Province of China(B2021109002);the Handan Science and Technology Research and Development Program(23422404149ZC);the On-campus Projects of Handan University(XZ2022201)

Abstract

Abstract:

The CdS quantum dots （QDs） were converted into CdS@PbS core-shell QDs with near-infrared （NIR） absorption capacity by cation exchange strategy in N，N-dimethylformamide （DMF） solvent. We characterized the morphology， elemental composition， crystal structure and optical properties of CdS@PbS core-shell QDs by transmission electron microscopy （TEM）， X-ray powder diffraction （XRD） and UV-Vis-NIR spectrophotometer. Considering their unique NIR absorption properties， these CdS@PbS core-shell QDs were specially utilized for fabricating self-powered photoelectrochemical-type NIR photodetector （PD）. The PDs exhibit an excellent photoresponse performance under 850 nm illumination， with a typical on/off ratio of 2277， a responsivity of 83.3 mA/W， and a detectivity of 2.91×10¹¹ Jones. Notably， the PD shows a good linear relationship between the photocurrent and the incident light intensity， indicating that the device can achieve stable detection under 850 nm illumination with different light intensities.

Key words: Near-infrared photodetector, Self-powered, CdS@PbS core/shell quantum dots, Cation exchange strategy

CLC Number:

O649.4

Xiao-Li LI, Yan-Li LI, Dong LI. Controllable Preparation of CdS@PbS Core/Shell Quantum Dots via Cation Exchange and Their Near-Infrared Photodetector[J]. Chinese Journal of Applied Chemistry, 2025, 42(8): 1078-1086.

Figures/Tables 7

Fig.1 Schematic illustration of the transformation of CdS quantum dots （QDs） into CdS@PbS core/shell QDs by cation exchange synthesis in DMF

Fig.2 FT-IR spectrum （A） and absorption spectra （B） of CdS QDs before and after ligand exchange

Fig.3 TEM images （A， B） and HAADF-STEM images （C， D） of CdS QDs before and after cation exchange

Fig.4 XRD pattern of the CdS QDs before and after cation exchange reaction

Fig.5 Absorption spectra of CdS@PbS QDs and PbS QDs

Fig.6 Schematic diagram of self-powered NIR photoelectrochemical photodetector based on CdS@PbS core/shell QDs （A）； Time response of the short-circuit photocurrent under 850 nm light illumination measured for light-on/off states （B）； The enlarged views of the photocurrent and dark current （C）； The enlarged views of rise time and decay time （D）； Short-circuit photocurrent as a function of the incident light intensity under 850 nm light illumination （E）； Stability test of self-powered NIR photoelectrochemical photodetector based on CdS@PbS core/shell QDs（F）

Table 1 Photoelectric performance parameters of self-powered photoelectrochemical-type photodetector

Photoactive materials	Light source/nm	Responsivity/（mA·W^-1）	Detectivity/Jones	Response time/ms	On/off ratio	Ref.
AgIn₅Se₈/FePSe₃	880	3.8×10^-3	5.7×10⁸	20	350	［30］
Bi₂O₂S nanosheet	850	11	8.14×10⁶	30/55	-	［31］
In₂Se₃ nanosheets	850	0.13	1.1×10⁸	1/2	-	［32］
Bi₂O₂Se nanosheets	850	3.7×10^-2	1.3×10⁷	100/140	-	［33］
TeSe nanorods	808	-	7.6×10⁵	-	-	［34］
PbS QDs	850	77.29	2.63×10¹¹	210/180	1 999	This work
CdS@PbS QDs	850	83.29	2.91×10¹¹	210/180	2 277	This work

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Controllable Preparation of CdS@PbS Core/Shell Quantum Dots via Cation Exchange and Their Near-Infrared Photodetector

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