Adimali Piyadasa | University of Connecticut-storrs (original) (raw)

Uploads

Papers by Adimali Piyadasa

Research paper thumbnail of Design and Fabrication of Micro-Pillar Based Piezoresistive Flow Sensors

This study is focused on developing a new type of micro-scale gas flow sensors to be used in crit... more This study is focused on developing a new type of micro-scale gas flow sensors to be used in critical environments such as combustion engines with high pressure high temperature gas flow and integrated micro electro mechanical applications such as lab-on-chip devices. Proposed flow sensor is based on piezoresistivity of Silicon micro column cantilever. Change in resistivity tensor due to gas flow induced stress in the piezoresistive layer results in generating of an output voltage proportional to the gas flow rate in the channel. Current results show that the anisotropic properties of the Silicon can be successfully used in the gas flow sensor to differentiate flow components in different directions. Furthermore the model demonstrates its applicability in measuring local flow fields in high resolution due to its micro-scale Adimali Piyadasa – University of Connecticut, 2017 dimensions. Fabrication of the Flow sensor is carried out at the Center for Functional nanomaterials at Brookh...

Research paper thumbnail of Robust and well-controlled TiO2–Al2O3 binary nanoarray-integrated ceramic honeycomb for efficient propane combustion

CrystEngComm, 2019

Well-tuned TiO2–Al2O3 binary nanoarrays had been fabricated onto ceramic honeycombs and exhibited... more Well-tuned TiO2–Al2O3 binary nanoarrays had been fabricated onto ceramic honeycombs and exhibited excellent robustness and catalytic activity for propane oxidation.

Research paper thumbnail of Band structure engineering strategies of metal oxide semiconductor nanowires and related nanostructures: A review

Semiconductor Science and Technology, 2017

Research paper thumbnail of Tunable UV response and high performance of zinc stannate nanoparticle film photodetectors

Journal of Materials Chemistry C, 2016

A robust, inexpensive, and scalable drop-casting process was successfully developed to fabricate ... more A robust, inexpensive, and scalable drop-casting process was successfully developed to fabricate highly efficient and robust UV photodetectors with uniform and continuous films of ZnSnO3 and Zn2SnO4–SnO2 nanoparticles for the first time. An extreme high responsivity of ∼0.5 A W−1 at 5.0 V bias was achieved with good visible-light rejection.

Research paper thumbnail of Single crystalline brookite titanium dioxide nanorod arrays rooted on ceramic monoliths: a hybrid nanocatalyst support with ultra-high surface area and thermal stability

CrystEngComm, 2013

In this study, a cost-effective solution synthesis of commercial scale single crystalline titaniu... more In this study, a cost-effective solution synthesis of commercial scale single crystalline titanium dioxide (TiO2) nanorod arrays has been successfully achieved on the inner walls of cordierite monoliths, which may provide a new class of nanostructured hybrid support for catalysis and energy applications. The morphological evolution has been observed from dandelion TiO2 nanorod clusters to vertically aligned nanorod arrays while increasing the solution treatment time. A heterogeneous nucleation–dissolution–crystallization mechanism is proposed for the growth of the brookite structured TiO2 nanorod arrays on the inner walls of honeycomb monoliths. The brookite structured TiO2 nanorod arrays have a high surface area up to ~250 m2 g−1, with an overall specific surface area in the hybrid nanostructured monolith increasing by 1.8 and 2.5 times after TiO2 nanorods coating for 4 h and 24 h, respectively. The thermal stability tests using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and hydrothermal stability tests under boiling water for 24 h suggest that the TiO2 nanorods coated hybrid monoliths are very stable. An as-prepared 9-cm-long TiO2 nanorod-array monolithic device was demonstrated as a continuous flow fixed-bed absorbent with efficient performance in Rhodamine B removal from aqueous solution.

Research paper thumbnail of Design and Fabrication of Micro-Pillar Based Piezoresistive Flow Sensors

This study is focused on developing a new type of micro-scale gas flow sensors to be used in crit... more This study is focused on developing a new type of micro-scale gas flow sensors to be used in critical environments such as combustion engines with high pressure high temperature gas flow and integrated micro electro mechanical applications such as lab-on-chip devices. Proposed flow sensor is based on piezoresistivity of Silicon micro column cantilever. Change in resistivity tensor due to gas flow induced stress in the piezoresistive layer results in generating of an output voltage proportional to the gas flow rate in the channel. Current results show that the anisotropic properties of the Silicon can be successfully used in the gas flow sensor to differentiate flow components in different directions. Furthermore the model demonstrates its applicability in measuring local flow fields in high resolution due to its micro-scale Adimali Piyadasa – University of Connecticut, 2017 dimensions. Fabrication of the Flow sensor is carried out at the Center for Functional nanomaterials at Brookh...

Research paper thumbnail of Robust and well-controlled TiO2–Al2O3 binary nanoarray-integrated ceramic honeycomb for efficient propane combustion

CrystEngComm, 2019

Well-tuned TiO2–Al2O3 binary nanoarrays had been fabricated onto ceramic honeycombs and exhibited... more Well-tuned TiO2–Al2O3 binary nanoarrays had been fabricated onto ceramic honeycombs and exhibited excellent robustness and catalytic activity for propane oxidation.

Research paper thumbnail of Band structure engineering strategies of metal oxide semiconductor nanowires and related nanostructures: A review

Semiconductor Science and Technology, 2017

Research paper thumbnail of Tunable UV response and high performance of zinc stannate nanoparticle film photodetectors

Journal of Materials Chemistry C, 2016

A robust, inexpensive, and scalable drop-casting process was successfully developed to fabricate ... more A robust, inexpensive, and scalable drop-casting process was successfully developed to fabricate highly efficient and robust UV photodetectors with uniform and continuous films of ZnSnO3 and Zn2SnO4–SnO2 nanoparticles for the first time. An extreme high responsivity of ∼0.5 A W−1 at 5.0 V bias was achieved with good visible-light rejection.

Research paper thumbnail of Single crystalline brookite titanium dioxide nanorod arrays rooted on ceramic monoliths: a hybrid nanocatalyst support with ultra-high surface area and thermal stability

CrystEngComm, 2013

In this study, a cost-effective solution synthesis of commercial scale single crystalline titaniu... more In this study, a cost-effective solution synthesis of commercial scale single crystalline titanium dioxide (TiO2) nanorod arrays has been successfully achieved on the inner walls of cordierite monoliths, which may provide a new class of nanostructured hybrid support for catalysis and energy applications. The morphological evolution has been observed from dandelion TiO2 nanorod clusters to vertically aligned nanorod arrays while increasing the solution treatment time. A heterogeneous nucleation–dissolution–crystallization mechanism is proposed for the growth of the brookite structured TiO2 nanorod arrays on the inner walls of honeycomb monoliths. The brookite structured TiO2 nanorod arrays have a high surface area up to ~250 m2 g−1, with an overall specific surface area in the hybrid nanostructured monolith increasing by 1.8 and 2.5 times after TiO2 nanorods coating for 4 h and 24 h, respectively. The thermal stability tests using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and hydrothermal stability tests under boiling water for 24 h suggest that the TiO2 nanorods coated hybrid monoliths are very stable. An as-prepared 9-cm-long TiO2 nanorod-array monolithic device was demonstrated as a continuous flow fixed-bed absorbent with efficient performance in Rhodamine B removal from aqueous solution.

Log In