Embedded Files
My research is focused on understanding the transport and sintering mechanism of various functional inks like Silver, Copper Nanoparticles and oxides printed on flexible substrates, and 2-D materials like SWCNT, and MoS2. Semiconductor device physics with various applications in the area of flexible and printable electronics is also an area of keen interest. Recently, I have also started working in the area of consciousness studies and trying to solve the enigma of consciousness by integrating vast Indian knowledge with the current understanding of science. Apart from the above, I am really passionate about understanding Human Behaviour & Relationship, Values-based Society, pedagogy of Science and Holistic Education, Philosophy and Psychology of Self, Epistemology under the light of Indian Wisdom.
Ongoing WORK
Ongoing WORK
Intense Pulsed Light (IPL) Sintering Mechanism on AlOx printed on Flexible Substrate
Intense Pulsed Light (IPL) Sintering Mechanism on AlOx printed on Flexible Substrate
We are currently working to understand the IPL Sintering mechanism of Aluminium Hydroxide printed on a flexible Substrate to be converted to AlOx at ambient conditions. This work intends to replace the organic dielectrics with this inorganic layer to provide a robust dielectric layer in the area of printable and flexible electronics.
This work is done in collaboration with the NCFLexE Ink team under the supervision of Prof. Y.N. Mohapatra. The team has successfully developed an in-house Aluminium precursor ink that can be converted to AlOx but only after 2 hours of UV treatment. Our contribution would be to make it happen in a fraction of second using IPL sintering.
This work has just started and will be a breakthrough once done with IPL as there is a significant challenge in printing a robust diectric layer .
Developing an array of fully inkjet-printed flexible SWCNT TFTs on PEN substrate
Developing an array of fully inkjet-printed flexible SWCNT TFTs on PEN substrate
This work is the extension of what I did during my PhD. We demonstrated flexible TFTs and logic gates in which all layers are inkjet printed using polymer wrapped semiconducting single walled carbon nanotubes (SWCNT) ink as channel layer and PVP ink as a dielectric layer on a flexible PEN substrate. These inkjet-printed semiconducting SWCNT-TFTs show excellent mobility of 30 cm^2/(V-s), small SS of 125 mV/dec and good on/off ratio > 10^4. We study the impact of hysteresis in the IDS-VGS curve of the TFT which is evidence for a large number of traps controlling the device characteristics. We quantify the impact of trapped charge on device characteristics by studying the sweep rate dependence of hysteresis. Further several preliminary applications are explored by designing flexible inverters, NAND and NOR gates using these TFTs. The value of gain in the inverter was achieved to be 3.0.
Now the goal is to make an array of fully inkjet-printed flexible SWCNT TFTs on PEN substrate in order to develop various intersting applications with it.
Consciousness: an emergent property of the brain or a fundamental property of the missing evolved atom?
Consciousness: an emergent property of the brain or a fundamental property of the missing evolved atom?
Consciousness, a perplexing scientific mystery acknowledged since ancient times in both Eastern and Western cultures, continues to elude modern science. We are all familiar with the subjective experience of consciousness but where does it originate? What creates consciousness? The prevailing assumption in modern neuroscience is that every aspect of consciousness emerges entirely from neural interactions within the brain. This materialistic worldview that consciousness is an emergent property of the brain is inadequate in explaining the subjective experience of consciousness. The reason and process behind this phenomenon remain poorly understood. If consciousness is more than the complex neural interactions, we need to explore new ways of thinking. This study endeavours to address the enigma of consciousness—its origin—by integrating insights from Madhyasth Darshan (MD) to bridge the gap in our current understanding of reality.
This work is being done with the collaboration of Prof. Lalit Saraswat.
PAST WORK
PAST WORK
Determination of Carrier mobility and understanding the transport mechanism in random network SWCNT
Determination of Carrier mobility and understanding the transport mechanism in random network SWCNT
SWCNT in its random network form, is a compelling prospect for flexible electronic application because of its excellent electrical & mechanical properties. In this work, we have demonstrated a flexible inkjet-printed SWCNT metal-semiconductor-metal (MSM) structure and evaluate its electrical properties using current-voltage (I-V), capacitance-voltage (C-V) characteristics, and impedance spectroscopy Z(f) as a function of temperature.
Further the sample was modeled as an RC circuit and mobility was investigated by three different methods - Nyquist / Cole-Cole plot [-Im(Z) vs Re(Z)], -Im(Z) vs Frequency and phase (Theta) vs Frequency. Then the conduction mechanism was further investigated and popular models of transport such as fluctuation induced tunnelling, variable range hopping are not applicable. The ln (mobility) is found to be proportional to E-1/4 and T2, over a wide range of field E, and temperature T. The temperature dependence of mobility is consistent with the prediction of percolation- tunneling model of transport recently proposed for such CNT networks.
Intense Pulsed Light (IPL) sintering mechanism of Copper Nanoparticle Ink for printed electronics
Intense Pulsed Light (IPL) sintering mechanism of Copper Nanoparticle Ink for printed electronics
On one side we tried to understand the sintering mechanism of standard photon-sintered copper samples by PulseForge.
On another side, we also tried developing our own low-budget flash sintering set-up to produce high-conductivity samples in a fraction of seconds.
The setup proposes the following advantages:
sintering at Room Temperature & ambient conditions.
better results than thermal sintered samples in terms of conductivity, nanoparticles interconnectedness & substrates having low Tg temperatures
Time-saving, Low-Cost & easily integrable with any setup
can be widely used in printed & flexible electronics products
Transport Mechanism in Polymeric embedded Silver & Copper Nanoparticles printed on Flexible Substrate
Transport Mechanism in Polymeric embedded Silver & Copper Nanoparticles printed on Flexible Substrate
We understood the transport mechanism in polymeric embedded Silver & Copper Nanoparticles printed on Flexible Substrate.
We initiated our studies by optimising the size & concentration of Silver Nanoparticles (AgNP) printed on the Paper substrate. Then, for optimised samples, we studied morphology using FE-SEM and conducted the Resistivity measurement of the sample from low temperature 10K to Room Temperature.
We found that it behaves like an impure polycrystalline metal.
This work was done in collaboration with SCDT under the supervision of Prof. Y.N.Mohapatra.
Our contributions/key findings are :
There is phase separation in the conducting layer of the printed silver & Copper Nanoparticles ink in the sample.
Resistivity Temperature Curve is similar to that of impure polycrystalline metal.
Developed a fully automated 4-probe Resistivity measurement from 10K to RT.
Page updated
Google Sites
Report abuse