The size dependent thermal diffusivity of water soluble CdTe quantum dots using dual beam thermal lens spectroscopy

Thermal Diffusivity of Aqueous Dispersions of Silicon Oxide Nanoparticles by Dual-Beam Thermal-Lens Spectrometry

“…In the region of low concentrations (up to 5 mg/mL), where a drop in thermal diffusivity is observed, the dispersions exhibit the properties of a heat insulator. Similar dynamics was observed for quantum dots, where at a concentration of 0.05 mg/mL, the decrease in D was maximum and amounted to more than 60% [14]. The region of higher concentrations, where the thermal diffusivity of dispersions increases, is suitable for the purposes of heat transfer and cooling [3].…”

“…For NPs with high optical absorption (quantum dots, metal NPs, etc. ), a significant change in thermal diffusivity is observed at a concentration of 0.01-0.1 mg/mL [14,17]. In our case, even though silicon oxide nanoparticles weakly absorb radiation, it is clearly shown that a significant change in D occurs at concentrations above 5 mg/mL.…”

Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens Spectrometry

“…On the contrary, TLS is highly sensitive to rather slight changes in the sample composition and also requires minimal sample preparation [ 42 , 43 ]. Emphasis of TLS application in this area is placed on the accurate calculation of thermophysical properties of nanofluids [ 36 , 43 , 44 , 45 , 46 ], biodiesel [ 47 , 48 ] solid multicomponent systems [ 49 ], nanoparticles [ 50 , 51 , 52 ], quantum dots [ 53 ], glasses [ 54 , 55 , 56 ], and semiconductors [ 57 ].…”

“…In the practice of thermal-lens measurements, the issues of trueness are given less attention, and the available results are non-systemic [ 63 , 64 ]. In applied research, the main emphasis is on the precision of the results, improperly considering this as the only factor that governs the accuracy [ 50 , 53 , 65 ]. Some aspects of the trueness of thermal-lens measurements are considered in the context of optimizing methods for a particular analyte (and, as a rule, only in relation to the signal amplitude), within which an original setup is designed, and its operation parameters are optimized [ 66 , 67 ].…”

Synergy of PVP and ethanol to synthesize Ni3S4 quantum dots for high-performance asymmetric supercapacitors

“…These highly active surface atoms have a significant effect on the properties of the QDs, such as high catalytic activity, and strong reduction and oxidation. [19][20][21] Making nickel sulfide into QDs can improve the electrochemical performance, including increasing the specific surface area, improving the electrochemical activity, and giving more charge transport routes. Preparation of nickel sulfide QDs has been reported, which usually involves toxic solvents and requires complex nitrogen protection and injection, for example, NiS 2 QDs synthesized in oleylamine, which demands a nitrogen atmosphere, 22 and Ni 3 S 4 QDs synthesized in ethylene glycol; 23 NiS 2 QD-C 3 N 4 composite materials have also been synthesized, but this method cannot synthesize pure NiS 2 QDs.…”