We investigate interfacial charge transfer and energy transfer in hybrids containing
low dimensional semiconductor nanomaterials like colloidal quantum
dots, 2D van Der Waals materials, perovskite quantum dots for potential
application in solar energy conversion, photodetectors, solid state light
biosensing. We develop assembly methods to create nanohybrids
with controlled optical and electronic behavior, for example regulated charge transfer,
regulated energy transfer or tunable plasmon-assissted emission.
Some examples highlighting our recent published work in this field are shown below.
Interfacial Charge and Energy Transfer in Low Dimensional Semiconductor Nanomaterials
Characterization of layer-dependent electron transfer in PbS/CdS quantum dot
- atomically thin MoS2 hybrids (ACS Nano 2019)
Demonstration of a biotic-abiotic nanohybrid photodetector based on a light
harvesting protein, quantum dots and 2D molybdenum diselenide enterteining
cascaded FRET (ACS Photonics 2019)
Our group publishes a perspective article on nanoscale charge transfer with
quantum dots reflecting our contribution to this field for the past decade (ACS
Simple self-assembly method of a conductive polymer on top of single layer
graphene results in photodetectors with dramatically improved photoresponse
(ACS Photonics 2018)
recent study we assembled quantum dots with layered tin disulfide to obtain
0D-2D hybrids with improved light harvesting properties. We found these
nanomaterials communicate by energy transfer, with the rate of this process
increasing with the increase f tin disulfide layers (ACS
Nano2016). Using this particular 0D-2D hybrid we built field effect
transistors with imroved photocurrent and spectral photoresponsivity (APL 2016).
We have been successful in detecting and monitoring signals from
individual lead sulfide-cadmium sulfide nanocrystals undergoing
electron transfer with titanium oxide and we have explored blinking of such
nanocrystals to understand interfacial electron transfer in these hybrids.
In this work we patented a surface-based self-assembly method to produce donor-bridge-acceptor Qdot-fullerene dimers
with varying bridge length and varying Qdot core size (bandgap), achieving
transfer (ET) through self-assembly and bandgap engineering.
In collaboration with Prof. Mathew Maye's group at Syracuse University, we produced a series of Qdot-conjugated polymer hybrids
with tunable hole transfer rate by using
core/shell Qdots with varying shell thickness and connecting the components by
electrostatic binding. (ACS-Nano2012,
2. Plasmonic QDs
In these studies done in collaboration with Prof. Gang (CFN-BNL/Columbia U.), we demonstrated
how DNA mediated self-assembly allows the control of
photoluminescence output in plasmonic gold NP-Qdot dimers and gold NP-multiQdots
superstructures (ChemComm 2010,