scholarly journals Spectrographic Microfluidic Memory

2005 ◽  
Author(s):  
David Erickson ◽  
Baiyang Li ◽  
James R. Adleman ◽  
Saurabh Vyawahare ◽  
Stephen Quake ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Recent Work ◽  
Data Storage ◽  
Emission Spectra ◽  
Semiconductor Quantum Dots ◽  
Excitation Wavelength ◽  
Data Encoding ◽  
New Class ◽  
Multiple Species ◽  
Tunable Emission

Recent advancements in micro- and nanoscale fluidic manipulation have enabled the development of a new class of tunable optical structures which are collectively referred to as optofluidic devices. In this paper we will introduce our recent work directed towards the development of a spectrographic optofluidic memory. Data encoding for the memory is based on creating spectrographic codes consisting of multiple species of photoluminescent nanoparticles at discrete intensity levels which are suspended in liquids. The data cocktails are mixed, delivered and stored using a series of soft and hard-lithography microfluidic structures. Semiconductor quantum dots are ideally suited for this application due to their narrow and size tunable emission spectra and consistent excitation wavelength. Both pressure driven and electrokinetic approaches to spectral code writing have been developed and will be experimentally demonstrated here. Novel techniques for data storage and readout are also discussed and demonstrated.

scholarly journals The bright future: Imaging dynamic cellular events with quantum dots

2010 ◽  
Vol 32 (3) ◽  
pp. 12-17 ◽  
Author(s):  
Andrew M. Smith ◽  
Mary M. Wen ◽  
Shuming Nie
Keyword(s):  
Quantum Dots ◽  
Light Emission ◽  
Emission Spectra ◽  
Semiconductor Quantum Dots ◽  
Broad Absorption ◽  
Light Emitting ◽  
Simultaneous Excitation ◽  
New Class ◽  
Cellular Events ◽  
Optical And Electronic Properties

Semiconductor quantum dots (QDs) are tiny light-emitting particles that have emerged as a new class of fluorescent labels for biology and medicine. Compared with traditional fluorescent probes, QDs have unique optical and electronic properties such as size-tuneable light emission, narrow and symmetric emission spectra, and broad absorption spectra that enable the simultaneous excitation of multiple fluorescence colours.

Quantum Dots Based Materials for Water Treatment

2021 ◽  
pp. 280-304
Keyword(s):  
Heavy Metals ◽  
Quantum Dots ◽  
Catalytic Activity ◽  
Water Treatment ◽  
Emission Spectra ◽  
Photo Catalytic Activity ◽  
New Class ◽  
Synthesis Properties ◽  
Sensing Application ◽  
Future Outcomes

Quantum dot is a new class of nanomaterials having size in nanometers (˂10 nm). This material has excellent photo-catalytic activity towards dyes and pollutants with great absorbance and photoluminescence properties. It shows shifting of peak in UV-FL data which indicates the excitation dependent emission spectra means tunable properties in different wavelength and this property makes it a wonderful probe for sensing application for different heavy metals, pollutants present in water. In this chapter the synthesis, properties, types, application of quantum dots and focus on the research that has been done in field of water treatment with possible future outcomes is discussed.

Synthesis and site-selective photoluminescence property of Ca8La2(PO4)6O2: Ce3+

2014 ◽  
Vol 1592 ◽  
Author(s):  
Ge Zhu ◽  
Yurong Shi ◽  
Masayoshi Mikami ◽  
Yasuo Shimomura ◽  
Yuhua Wang
Keyword(s):  
Emission Spectra ◽  
Photoluminescence Property ◽  
Excitation Wavelength ◽  
Photoluminescence Excitation ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Color Tunable ◽  
Site Selective ◽  
Tunable Emission

ABSTRACTA series of Ce3+ doped Ca8La2(PO4)6O2 phosphors with tunable emission were successfully synthesized by traditional solid state reaction. The crystal structure and photoluminescence properties were studied through X-ray diffraction, photoluminescence excitation and emission spectra. The results indicated that Ca8La2(PO4)6O2:Ce3+ exhibited color-tunable emission due to the 5d-4f transitions of Ce3+ ions under different wavelength excitation. The optimal doping content of Ce3+ ions in Ca8La2(PO4)6O2 was found to be 5 mol%. The site-selective photoluminescence property and the reason for red-shift of the emission band along with Ce3+ content and the excitation wavelength were also studied in detail.

scholarly journals Semiconductor Quantum Dots Surface Modification for Potential Cancer Diagnostic and Therapeutic Applications

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Jidong Wang ◽  
Shumin Han ◽  
Dandan Ke ◽  
Ruibing Wang
Keyword(s):  
Quantum Dots ◽  
Surface Modification ◽  
Photophysical Properties ◽  
Aqueous Media ◽  
Simultaneous Detection ◽  
Emission Spectra ◽  
Semiconductor Quantum Dots ◽  
Therapeutic Applications ◽  
Cancer Diagnostic ◽  
Potential Cancer

Semiconductor Quantum dots (QDs) have generated extensive interest for biological and clinical applications. These applications arise from their unique properties, such as high brightness, long-term stability, simultaneous detection of multiple signals, tunable emission spectra. However, high-quality QDs, whether single or core-shell QDs, are most commonly synthesized in organic solution and surface-stabilized with hydrophobic organic ligands and thus lack intrinsic aqueous solubility. For biological applications, very often it is necessary to make the QDs dispersible in water and therefore to modify the QD surfaces with various bifunctional surface ligands or caps to promote solubility in aqueous media. Well-defined methods have been developed for QD surface modification to impart biocompatibility to these systems. In this review, we summarize the recent progress and strategies of QDs surface modification for potential cancer diagnostic and therapeutic applications. In addition, the question that arose from QD surface modification, such as impact of size increase of QD bioconjugates after surface-functionalization or surface modification on photophysical properties of QDs, are also discussed.

Quantum Dots: Next Generation of Smart Nano-Systems

2019 ◽  
Vol 7 (3) ◽  
pp. 234-245 ◽  
Author(s):  
Mohammed Asadullah Jahangir ◽  
Sadaf Jamal Gilani ◽  
Abdul Muheem ◽  
Mohammed Jafar ◽  
Mohammed Aslam ◽  
...  
Keyword(s):  
Biological Sciences ◽  
Quantum Dots ◽  
Animal Studies ◽  
Emission Spectra ◽  
Optical Probe ◽  
Pharmacokinetic Studies ◽  
Next Generation ◽  
Preparation Methods ◽  
Practical Applications ◽  
New Class

Background: The amalgamation of biological sciences with nano stuff has significantly expedited the progress of biological strategies, greatly promoting practical applications in biomedical fields. Objective: With distinct optical attributes (e.g., robust photostability, restricted emission spectra, tunable broad excitation, and high quantum output), fluorescent quantum dots (QDs) have been feasibly functionalized with manageable interfaces and considerably utilized as a new class of optical probe in biological investigations. Method: In this review article, we structured the current advancements in the preparation methods and attributes of QDs. Furthermore, we extend an overview of the outstanding potential of QDs for biomedical research and radical approaches to drug delivery. Conclusion: Notably, the applications of QDs as smart next-generation nanosystems for neuroscience and pharmacokinetic studies have been explained. Moreover, recent interests in the potential toxicity of QDs are also apprised, ranging from cell investigations to animal studies.

Synthesis of green-emitting carbon quantum dots with excitation wavelength dependent photoluminescence obtained from aqueous beetroot extract

MRS Advances ◽  
2016 ◽  
Vol 1 (19) ◽  
pp. 1371-1376 ◽  
Author(s):  
George R. S. Andrade ◽  
Silvânio S. L. Costa ◽  
Cristiane C. Nascimento ◽  
Iara F. Gimenez
Keyword(s):  
Quantum Dots ◽  
Carbon Source ◽  
Energy Efficient ◽  
Emission Spectra ◽  
Carbon Quantum Dots ◽  
Excitation Wavelength ◽  
Photoluminescence Properties ◽  
Microwave Assisted ◽  
Band Position ◽  
The One

ABSTRACTIn this work, 3 simple, fast, labour and energy efficient methodologies were used to prepare carbon quantum dots (C-dots) using a red beetroot (Beta vulgaris subsp. vulgaris var. vulgaris) aqueous extract as the carbon source: alkali-assisted (AA), microwave-assisted (MA) and alkali-microwave-assisted (AMA) synthesis. TEM images shows nanoparticles with a nearly spherical morphology and diameters around 7.0 nm. FTIR spectra show characteristic peaks of C-H, C-O, O-H and C=C bonds for all the samples. The emission spectra show an interesting feature of the as-prepared samples: the emission band position can be tunable by changing the excitation wavelength. Comparing the 3 different methodologies in terms of photoluminescence properties, the one based only on the microwave-assisted heating has showed the most improved emission.

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