研究目的
Evaluating the potential of Scanning Acoustic Microscopy (SAM) in the detection of lead-sulphide (PbS), graphene and cadmium-telluride/cadmium sulphide (CdTe/CdS) quantum dot aggregates for the first time.
研究成果
The success of SAM in monitoring the QD aggregates is promising for the diagnosis of patients with potentially vulnerable plaques or tumors in vivo. SAM enables the early diagnosis and also the follow-up of the treatment of a specific disease, as it is capable of acquiring morphological and chemical information simultaneously.
研究不足
The study was unable to measure the volumes of the aggregates and establish a correlation between acoustic impedance value and the volume of the aggregate due to the 2-D nature of SAM imaging.
1：Experimental Design and Method Selection:
The study utilized Scanning Acoustic Microscopy (SAM) to image quantum dot aggregates, comparing reflected ultrasound signals from the surfaces of water and the samples.
2：Sample Selection and Data Sources:
Colloidal suspensions of QDs were dripped onto Petri dishes and allowed to evaporate before examination.
3：List of Experimental Equipment and Materials:
An 80 MHz transducer with quartz lens, a pulser/receiver, an oscilloscope, a computer, and a display monitor were used for SAM. Ultraviolet-visible spectroscopy and fluorescence microscopy were also employed.
4：Experimental Procedures and Operational Workflow:
QD aggregates were characterized by SAM at room temperature, with signals averaged by 8 times and a step size in the raster scan of the samples of
5：5 GS/s. Data Analysis Methods:
Acoustic impedance values of QD aggregates were calculated by comparing reflected signals from the target with those from a reference material.
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