Sebastião William da Silva

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Nanosized maghemite particles were synthesized, precoated (with dimercaptosuccinic acid) and surface-functionalized with anticarcinoembryonic antigen (anti-CEA) and successfully used to target cell lines expressing the CEA, characteristic of colorectal cancer (CRC) cells. The as-developed nanosized material device, consisting of surface decorated maghemite(More)
BACKGROUND Photodynamic therapy (PDT) combines light, molecular oxygen and a photosensitizer to induce oxidative stress in target cells. Certain hydrophobic photosensitizers, such as aluminium-phthalocyanine chloride (AlPc), have significant potential for antitumor PDT applications. However, hydrophobic molecules often require drug-delivery systems, such as(More)
We report the results of time-integrated and time-resolved photoluminescence spectroscopy on red-emitting self-organized InAs/Al 0.6 Ga 0.4 As quantum dots with indirect barriers. Spatially resolved PL measurements confirm that carriers excited in the Al 0.6 Ga 0.4 As barriers are consistent with a carrier hopping process between dots, a result also(More)
We have investigated the quantum dot (QD) carrier capture mechanism using continuous wave photoluminescence as a function of the optical excitation intensity using a sample with a QD density gradient across its surface ranging from 0 to 1.8 £ 10 11 cm 22. Modelling of the carrier kinetics has been described by a set of three coupled rate equations(More)
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