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Dive into the research topics where Prarthana Gowda is active.

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Featured researches published by Prarthana Gowda.


ACS Applied Materials & Interfaces | 2014

Enhanced photoresponse in monolayer hydrogenated graphene photodetector.

Prarthana Gowda; Dipti Ranjan Mohapatra; Abha Misra

We report the photoresponse of a hydrogenated graphene (H-graphene)-based infrared (IR) photodetector that is 4 times higher than that of pristine graphene. An enhanced photoresponse in H-graphene is attributed to the longer photoinduced carrier lifetime and hence a higher internal quantum efficiency of the device. Moreover, a variation in the angle of incidence of IR radiation demonstrated a nonlinear photoresponse of the detector, which can be attributed to the photon drag effect. However, a linear dependence of the photoresponse is revealed with different incident powers for a given angle of IR incidence. This study presents H-graphene as a tunable photodetector for advanced photoelectronic devices with higher responsivity. In addition, in situ tunability of the graphene bandgap enables achieving a cost-effective technique for developing photodetectors without involving any external treatments.


ACS Applied Materials & Interfaces | 2014

Defect-induced enhancement and quenching control of photocurrent in few-layer graphene photodetectors.

Prarthana Gowda; Tushar Sakorikar; Siva Kumar Reddy; Darim B. Ferry; Abha Misra

A novel approach is presented for achieving an enhanced photoresponse in a few layer graphene (FLG) based photodetector that is realized by introducing defect sites in the FLG. Fabrication induced wrinkle formation in graphene presented a four-fold enhancement in the photocurrent when compared to unfold FLG. Interestingly, it was observed that the addition of few multiwalled carbon nanotubes to an FLG improves the photocurrent by two-fold along with a highly stable response as compared to FLG alone.


Nanotechnology | 2014

Chemical vapor detection using nonlinear electrical properties of carbon nanotube bundles

Prarthana Gowda; Ashish Suri; Siva Kumar Reddy; Abha Misra

We demonstrate the electrical transport behavior of carbon nanotubes (CNTs) upon exposure to organic analytes (namely ethanol, benzene, acetone and toluene). The resulting nonlinear current-voltage characteristics revealed a power law dependence of the differential conductivity on the applied bias voltage. Moreover, suppression of differential conductivity at zero bias is found to be dependent on different selective analytes. The power law exponent values have been monitored before, during and after exposure to the chemicals, which revealed a reversible change in the number of electron conducting channels. Therefore, the reduction in the number of conductive paths can be attributed to the interaction of the chemical analyte on the CNT surfaces, which causes a decrease in the differential conductivity of the CNT sample. These results demonstrate chemical selectivity of CNTs due to varying electronic interaction with different chemical analytes.


RSC Advances | 2015

Giant actuation in bulk carbon nanotubes under coupled electric and magnetic fields

Prarthana Gowda; Soumalya Mukherjee; Siva Kumar Reddy; Rituparna Ghosh; Abha Misra

We report an enhanced actuation in bulk carbon nanotubes (CNTs) under coupled electric and magnetic fields, which is much higher than that evaluated in the presence of individual fields. Coupled electric and magnetic fields induce a directional actuation demonstrating a transformation from polarity independent to dependent actuation behavior of CNTs. Both qualitative and quantitative analyses are performed to understand this transformation in the bulk CNTs. Moreover, actuations along radial and axial directions of CNTs have also demonstrated a similar directional behavior.


Nanotechnology | 2014

Nonlinear optical absorption in a graphene infrared photodetector.

Prarthana Gowda; Dipti Ranjan Mohapatra; Abha Misra

The photoresponse of the graphene photodetector elucidated strong dependence on several optical parameters, such as the angle of incidence and the incident power of infrared exposure at room temperature. The sinusoidal dependence of the photoresponse on incidence angle, which had not been realized before, has now been revealed. The combined effect of the photo excited charge carrier and the photon drag effect explain this nonlinear optical absorption in graphene at lower incident power. The nonlinear dependence of the charge carrier generation on the incident power revealed that this process contributed to the nonlinear photoresponse. However, a deviation is observed at a higher incident power due to the induction of thermal effects in the graphene lattice. This work demonstrates the tunability of the graphene photodetector under a systematic variation that involves both parameters.


Applied Physics Letters | 2014

Tuning of the electro-mechanical behavior of the cellular carbon nanotube structures with nanoparticle dispersions

Prarthana Gowda; U. Ramamurty; Abha Misra

The mechanical and electrical characteristics of cellular network of the carbon nanotubes (CNT) impregnated with metallic and nonmetallic nanoparticles were examined simultaneously by employing the nanoindentation technique. Experimental results show that the nanoparticle dispersion not only enhances the mechanical strength of the cellular CNT by two orders of magnitude but also imparts variable nonlinear electrical characteristics; the latter depends on the contact resistance between nanoparticles and CNT, which is shown to depend on the applied load while indentation. Impregnation with silver nanoparticles enhances the electrical conductance, the dispersion with copper oxide and zinc oxide nanoparticles reduces the conductance of CNT network. In all cases, a power law behavior with suppression in the differential conductivity at zero bias was noted, indicating electron tunneling through the channels formed at the CNT-nanoparticle interfaces. These results open avenues for designing cellular CNT foams with desired electro-mechanical properties and coupling


Carbon | 2013

Effect of electro-mechanical coupling on actuation behavior of a carbon nanotube cellular structure

Piyush Jagtap; Prarthana Gowda; Bikramjit Das; Praveen Kumar


Carbon | 2014

Electric field induced ultra-high actuation in a bulk carbon nanotube structure

Prarthana Gowda; Praveen Kumar; Rahul Tripathi; Abha Misra


Nanoscale | 2015

Photoresponse of double-stacked graphene to Infrared radiation.

Prarthana Gowda; Dipti Ranjan Mohapatra; Abha Misra


World Academy of Science, Engineering and Technology, International Journal of Materials and Metallurgical Engineering | 2015

Defect Induced Enhanced Photoresponse in Graphene

Prarthana Gowda; Tushar Sakorikar; Siva Kumar Reddy; Darim B. Ferry; Abha Misra

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Abha Misra

Indian Institute of Science

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Siva Kumar Reddy

Indian Institute of Science

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Dipti Ranjan Mohapatra

Indian Institute of Technology Bombay

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Praveen Kumar

Indian Institute of Science

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Darim B. Ferry

Indian Institute of Science

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Piyush Jagtap

Indian Institute of Science

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Bikramjit Das

National Institute of Technology

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Rahul Tripathi

Indian Institute of Science

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Rituparna Ghosh

Indian Institute of Science

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Soumalya Mukherjee

Indian Institute of Science

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