Green-Emitting Carbon Quantum Dots: Highly Sensitive Temperature Sensing Probe in Nanocomposite and Lubrication System

IF 3.1 3区工程技术 Q2 ENGINEERING, MECHANICAL Lubricants Pub Date : 2024-03-11 DOI:10.3390/lubricants12030088

Jiannan Sun, Ke Yan, Pan Zhang, A. Pan, Xuehang Chen, Xinyi Shi

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Abstract

Carbon quantum dots (CQDs) have already demonstrated their utility as lubricant additives, and non-contact temperature sensing based on CQDs offers considerable potential for condition monitoring in mechanical, electrical, and other fields, as well as lubrication-temperature multifunctional applications in lubricants. In this paper, we have successfully synthesized and designed high-brightness carbon quantum dots/polyvinyl alcohol (PVA) temperature sensor thin film and dispersions of CQDs in a liquid paraffin lubrication system. Based on fluorescence intensity and the fluorescence intensity ratio, the carbon quantum dot/PVA film exhibited exponential temperature-dependent properties with a wide applicability range, a high goodness of fit (R2 > 0.99), and high relative thermal sensitivity (relative sensitivities of 1.74% K−1 and 1.39% K−1 for fluorescence intensity and fluorescence intensity ratio, respectively). In addition, based on the fluorescence intensity, the CQDs exhibited a wide temperature range (20–90 °C), a high goodness of fit (R2 > 0.99), and higher sensitivity (2.84% K−1) in a liquid paraffin lubrication system, which reflects the temperature responsive properties of carbon quantum dots as additives in lubrication systems. These findings provide convenient and effective possibilities for the sensing and monitoring of carbon quantum dots and their multifunctional applications under lubrication systems.

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绿色发光碳量子点：纳米复合材料和润滑系统中的高灵敏度温度传感探针

碳量子点（CQDs）已经证明了其作为润滑油添加剂的实用性，基于 CQDs 的非接触温度传感在机械、电气和其他领域的状态监测以及润滑油中的润滑-温度多功能应用方面具有相当大的潜力。本文成功合成并设计了高亮度碳量子点/聚乙烯醇（PVA）温度传感器薄膜以及 CQDs 在液体石蜡润滑系统中的分散体。根据荧光强度和荧光强度比，碳量子点/聚乙烯醇薄膜表现出指数温度依赖性，适用范围广，拟合度高（R2 > 0.99），相对热灵敏度高（荧光强度和荧光强度比的相对灵敏度分别为 1.74% K-1 和 1.39% K-1）。此外，基于荧光强度，碳量子点在液体石蜡润滑系统中表现出较宽的温度范围（20-90 °C）、较高的拟合优度（R2 > 0.99）和较高的灵敏度（2.84% K-1），这反映了碳量子点作为润滑系统添加剂的温度响应特性。这些发现为碳量子点在润滑系统中的传感和监测及其多功能应用提供了方便和有效的可能性。

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来源期刊

Lubricants Engineering-Mechanical Engineering

CiteScore

3.60

自引率

25.70%

发文量

293

审稿时长

11 weeks

期刊介绍： This journal is dedicated to the field of Tribology and closely related disciplines. This includes the fundamentals of the following topics: -Lubrication, comprising hydrostatics, hydrodynamics, elastohydrodynamics, mixed and boundary regimes of lubrication -Friction, comprising viscous shear, Newtonian and non-Newtonian traction, boundary friction -Wear, including adhesion, abrasion, tribo-corrosion, scuffing and scoring -Cavitation and erosion -Sub-surface stressing, fatigue spalling, pitting, micro-pitting -Contact Mechanics: elasticity, elasto-plasticity, adhesion, viscoelasticity, poroelasticity, coatings and solid lubricants, layered bonded and unbonded solids -Surface Science: topography, tribo-film formation, lubricant–surface combination, surface texturing, micro-hydrodynamics, micro-elastohydrodynamics -Rheology: Newtonian, non-Newtonian fluids, dilatants, pseudo-plastics, thixotropy, shear thinning -Physical chemistry of lubricants, boundary active species, adsorption, bonding