Method for measuring ligand content on quantum dot surface and preparation method for quantum dot ink
A preparation method and technology of surface ligands, which are used in chemical analysis by titration, electrochemical variables of materials, etc., can solve the problems of insoluble quantum dots, inability to perform inkjet printing, and low pixel resolution.
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Embodiment 1
[0058] 1. Determine the relative content of the characteristic element S in the surface ligand of the standard particle CdSe quantum dot (the surface ligand is decylthiol) as ω 1 .
[0059] ① Preparation of 0.0l mol / L silver nitrate alcohol standard titration solution, dissolve 1.7 g silver nitrate in 10 mL deionized water in a 1000 mL volumetric flask, and dilute to the mark with isopropanol;
[0060] ②Preparation of alkaline titration solvent, absorb 1.6 g of anhydrous sodium acetate and dissolve it in 25 mL of anaerobic water, and then inject it into 975 mL of isopropanol;
[0061] ③ Preparation of silver-silver sulfide electrode, 1) Polish the silver terminal of the silver electrode with sandpaper. 2) Immerse the silver terminal of the polished silver electrode in 100 mL of alkaline titration solvent containing 7 mL of 1 wt% sodium sulfide solution. 3) Under the condition of stirring, slowly add 80 mL, 0.01 mol / L silver nitrate alcohol standard titration solution from th...
Embodiment 2
[0065] 1. Determine the standard particle CeO 2 The relative content of the characteristic element N in the surface ligand of the quantum dot (the surface ligand is n-hexylamine) is ω 1 .
[0066] ①Preparation of 0.1 mol / L perchloric acid standard titration solution, take 8.5mL of perchloric acid (70%) in a 1000mL volumetric flask, add 100 mL of isopropanol to dissolve, add dioxane to dilute to the mark ;
[0067] ② For sample testing, accurately weigh 30 mg of sample particles and place them in a 250 mL Erlenmeyer flask or a matching titration cup for an instrument with a corresponding range, add 50 mL of isopropanol, and shake to disperse the sample particles in the solvent. Set potential preset value dE(set) =16 mV, minimum titrant addition dV(min) = 0.02 mL, maximum titrant addition dV(max) = 0.2 mL, potential balance allowable value dE = 5 mV, potential value Recording time dt = 0.5 s, minimum potential value recording time dt(min) = 1 s, maximum potential value record...
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