Multiphoton photosensitization system
A single-photon, semiconductor technology, applied in microlithography exposure equipment, optics, optomechanical equipment, etc., can solve the problems of low photosensitivity, high laser power, slow writing speed, etc., to improve photosensitivity and enhance multi-photon photosensitivity sexual effect
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Embodiment 1
[0172] Example 1: Multiphoton photopolymerization using (CdSe)ZnS nanoparticles
[0173]Multiphoton photopolymerization was performed using a photoinitiator system consisting of CdSe nanoparticles, a cyanine dye (single-photon photosensitizer) whose absorption band corresponds to the fluorescence emission band of the CdSe nanoparticles, an electron acceptor, and an electron donor. CdSe nanoparticles were prepared as follows using a slightly modified method as described in J. Am. Chem. Soc. 115, 8706 (1993). Unless otherwise stated, chemicals were purchased from Aldrich Chemical Co., Milwaukee, WI.
[0174] Preparation of (CdSe)ZnS Nanoparticles
[0175] 30 g of tri-n-octylphosphine oxide (TOPO) (STREM Chemicals, Newburyport, MA) was dried under vacuum at 175° C. for 4 hours in a 250 ml three necked round bottom flask equipped with a temperature probe, condenser and septum. The TOPO was then placed under nitrogen and the temperature was raised to 350°C. Into the flask wa...
Embodiment 2
[0195] Example 2: Multiphoton photopolymerization using (ZnSe)ZnS nanoparticles
[0196] Multiphoton photopolymerization was performed using a photoinitiator system consisting of ZnSe nanoparticles and electron acceptors.
[0197] Preparation of ZnS nanoparticles
[0198] ZnSe nanoparticles were prepared as follows using a slightly modified synthetic method described in J. Phys. Chem. B, 102(19), 3655 (1998). Using standard airless techniques, 56.25 g (75 mL) of cetylamine was dried and degassed under vacuum at 125 °C for 2 hours. The cetylamine was then heated to 310°C under 1 atmosphere of nitrogen. 0.41 mL (4 mmol) of diethylzinc (Aldrich Chemical Company) was mixed with 20 mL of trioctylphosphine (Fluka Chemicals, Steinheim, Germany) and 5 mL of a 1 M solution of trioctylphosphine selenide in trioctylphosphine. The resulting solution was quickly poured into vigorously stirred cetylamine at 310°C. The temperature of the resulting solution was lowered to 280°C. Afte...
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