Synthesis, Chemical-Physical Properties and Applications of Quantum Dots Nanocrystals

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Physical Chemistry at Nanoscale".

Deadline for manuscript submissions: 20 May 2025 | Viewed by 1532

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Department of Applied Science and Technology, Corso Duca degli Abruzzi, 24, I-10129 Torino, Italy
Interests: synthesis and characterization of heterostructured nanomaterials; quantum dots; J-aggregates; colloidal synthesis; photocatalysis
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Dear Colleagues,

Colloidal quantum dots (QDs), semiconductor nanocrystals with dimensions on the nanometer scale, exhibit extraordinary quantum mechanics properties. They show controllable optical and electronic characteristics, finely tuned through the manipulation of their composition and crystal structure. Their unique features enable the engineering of materials with adjustable light absorption, bright emission of pure colors, and versatile tuning of chemical and physical functions.

Since their discovery, QDs have garnered significant attention in academia and industry, catalyzing advancements across various technologies, including solar energy conversion, light-emitting devices, bioimaging, photocatalysis, and quantum computing. In recognition of their impact, the Nobel Prize in Chemistry 2023 was awarded for the discovery and development of QDs.

We invite researchers to contribute to this Special Issue, focusing on research papers (including articles and reviews) related to the synthesis and advanced physical and chemical properties of semiconductor nanocrystals (both traditional and perovskite quantum dots) and their applications.

We look forward to receiving your valuable contributions.

Dr. Francesca Stefania Freyria
Guest Editor

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Keywords

  • quantum dots
  • semiconductor
  • nanocrystal
  • surface effect
  • electrical conductivity
  • fluorescence
  • optical properties

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Published Papers (1 paper)

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Research

17 pages, 3778 KiB  
Article
High-Performance Ammonia QCM Sensor Based on SnO2 Quantum Dots/Ti3C2Tx MXene Composites at Room Temperature
by Chong Li, Ran Tao, Jinqiao Hou, Huanming Wang, Chen Fu and Jingting Luo
Nanomaterials 2024, 14(22), 1835; https://doi.org/10.3390/nano14221835 - 16 Nov 2024
Viewed by 1309
Abstract
Ammonia (NH3) gas is prevalent in industrial production as a health hazardous gas. Consequently, it is essential to develop a straightforward, reliable, and stable NH3 sensor capable of operating at room temperature. This paper presents an innovative approach to modifying [...] Read more.
Ammonia (NH3) gas is prevalent in industrial production as a health hazardous gas. Consequently, it is essential to develop a straightforward, reliable, and stable NH3 sensor capable of operating at room temperature. This paper presents an innovative approach to modifying SnO2 colloidal quantum dots (CQDs) on the surface of Ti3C2Tx MXene to form a heterojunction, which introduces a significant number of adsorption sites and enhances the response of the sensor. Zero-dimensional (0D) SnO2 quantum dots and two-dimensional (2D) Ti3C2Tx MXene were prepared by solvothermal and in situ etching methods, respectively. The impact of the mass ratio between two materials on the performance was assessed. The sensor based on 12 wt% Ti3C2Tx MXene/SnO2 composites demonstrates excellent performance in terms of sensitivity and response/recovery speed. Upon exposure to 50 ppm NH3, the frequency shift in the sensor is −1140 Hz, which is 5.6 times larger than that of pure Ti3C2Tx MXene and 2.8 times higher than that of SnO2 CQDs. The response/recovery time of the sensor for 10 ppm NH3 was 36/54 s, respectively. The sensor exhibited a theoretical detection limit of 73 ppb and good repeatability. Furthermore, a stable sensing performance can be maintained after 30 days. The enhanced sensor performance can be attributed to the abundant active sites provided by the accumulation/depletion layer in the Ti3C2Tx/SnO2 heterojunction, which facilitates the adsorption of oxygen molecules. This work promotes the gas sensing application of MXenes and provides a way to improve gas sensing performance. Full article
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