Dr. Devendra P. S. Negi

Chemistry Department

Designation: Assistant Professor

Qualifications:

  • Ph.D. (Physical Chemistry) from IIT Roorkee, 2001
  • M.Sc. (Chemistry) from IIT Roorkee, 1995

Professional Experiences

  • Post-doctoral Fellow: Chungnam National University, Taejon, South Korea (July 2001 - June 2002)
  • Assistant Professor: Department of Chemistry, NEHU (June 2003 – till date)

Awards and Honours

  • Received Outstanding Reviewer Award from IOP Publishing, Bristol, United Kingdom, in 2018 for Materials Research Express.

Areas of Interest/Specialization: Fluorescence / Colorimetric Sensing and Semiconductor Photocatalysis

Phd Awarded/Supervised: 2

Research Group

Present Members

  • Wandibahun Warjri
  • Siewdorlang Diamai
  • Dipika Saha

Past Members

  • T. Inakhunbi Chanu
  •  L. Meerabai Devi

Administrative responsibilities undertaken: 

  • Member, Board of Studies in Chemistry, NEHU
  • Member, Board of Studies in Nanotechnology, NEHU
  • Member, Board of Studies in Biotechnology, NEHU
  • Member, School Board of Physical Sciences, NEHU


 

Research Projects

Investigation of Photophysical and Photocatalytic Properties of Colloidal Semiconductors: Sponsored by Department of Science and Technology, New Delhi (2006-2009).

Publications

List of Publications

  • pH Dependant competitive N-de-ethylation and degradation of Rhodamine B photocatalyzed by cationic surfactant stabilized ZnS nanoparticles. W. Warjri and D.P.S. Negi, Indian J.  Chem., 58A (2019) 554-560
  • Cysteine-stabilized silver nanoparticles as a colorimetric probe for the selective detection of cysteamine. S. Diamai and D.P.S. Negi, Spectrochim. Acta  A, 215 (2019) 203-208.
  • Effect of pH on the interaction of hypoxanthine and guanine with colloidal ZnS nanoparticles: A spectroscopic approach. D. Saha, S. Diamai, W. Warjri and D.P.S. Negi, J. Mol. Liq. 278 (2019) 460-466.
  • Catechol oxidase mimetic activity of cadmium sulfide nanoparticles for the oxidation of L-3,4 – dihydroxyphenylalanine. W. Warjri, D. Saha, S. Diamai and D.P.S. Negi, Materials Research Express 6 (2019) 035020.
  • Sensitive determination of 6-mercaptopurine based on the aggregation of phenylalanine-capped gold nanoparticles. S. Diamai, W. Warjri, D. Saha, D. P.S. Negi, Colloids Surf. A , 538 (2018) 593-599.
  •  Spectroscopic investigations on the interaction of thioacetamide with ZnO quantum dots and application for its fluorescence sensing. D. Saha, D.P.S. Negi, Spectrochim. Acta A, 189 (2018) 516-521.
  • EDTA-capped gold nanoparticles as a colorimetric probe for aluminium. S. Diamai, D.P.S. Negi, Mater. Res. Express, 3 (2016) 115002.
  • Au@Co0.4S core-shell nanoparticles: synthesis, characterization and evaluation of photocatalytic activity. W. Warjri, D.P.S. Negi, Mater. Res. Express, 3 (2016) 095004.
  • Synthesis of zinc sulfide nanoparticles stabilized by sodium dodecylsulfate micelles and evaluation of photocatalytic activity. L.M. Devi, D.P.S. Negi, Ind. J. Chem., 54A (2015) 1440-1445.
  • Fluorescence-based selective sensing of 1,2,4-trihydroxybenzene using histidine-stabilized ZnS nanospheres. L.M. Devi, D.P.S. Negi, Mater. Res. Express, 1 (2014) 015008.
  • Effect of starting pH and stabilizer/metal ion ratio on the photocatalytic activity of ZnS nanoparticles. L.M. Devi, D.P.S. Negi, Mater. Chem. Phys., 141 (2013) 797-803.
  • Photophysical and photocatalytic properties of histidine-stabilized CdS quantum dots in the presence of indole. T.I. Chanu, D.P.S. Negi, Chem. Phys. Lett., 522 (2012) 62-66.
  • Sensitive and selective detection of adenine using fluorescent ZnS nanoparticles. L.M. Devi, D.P.S. Negi, Nanotechnology, 22 (2011) 245502.
  • Synthesis of histidine-stabilized cadmium sulfide quantum dots: Study of their fluorescence behaviour in the presence of adenine and guanine. T.I. Chanu, D.P.S. Negi, Chem. Phys. Lett., 491 (2010) 75-79.
  • Surface-modified CdS nanoparticles as a fluorescent probe for the selective detection of cysteine. D.P.S. Negi, T.I. Chanu, Nanotechnology, 19 (2008) 465503.
  • Photoinduced electron transfer in some photosensitive molecules-incorporated semiconductor/zeolites: New photocatalytic systems. M. Yoon and D.P.S. Negi, Proceeding of Indian Academy of Sciences (Chemical Sciences),114 (2002) 593-602.
  • Photophysics and photocatalytic properties of Cd(OH)2 –coated Q-CdS clusters in the presence of guanine and related compounds. A. Kumar and D.P.S. Negi, J. Colloid Interface Sci., 238 (2001) 310-317.
  • Photophysical and photocatalytic behaviours of Cd(OH)2 –coated Q-CdS in the presence of tryptophan. A. Kumar and D.P.S. Negi, J. Photochem. Photobiol. A, 134 (2000) 199-207.
  • Photocatalytic oxidative C-C bond cleavage of the pyrrole ring in 3-methylindole induced by colloidal CdS particles. A. Kumar, S. Kumar and D.P.S. Negi, J. Chem. Res. (S), (1998) 54-55.

Papers presented in Conferences/Seminars

  • Delivered an invited lecture entitled “Colorimetric sensing of Al3+ and 6-mercaptopurine using functionalized gold nanoparticles” at Third International Conference on Nanomaterials: Synthesis, Characterization and Applications at Mahatma Gandhi University, May 11-13, 2018, Mahatma Gandhi University, Kottayam, India.
  • Presented a poster entitled “Photocatalytic degradation of methyl orange using sodium dodecylsulfate micelle stabilized colloidal ZnS nanoparticles” at Materials Research Society of India Symposium on Advanced Materials for Sustainable Applications, February 18-21, 2016, CSIR-NEIST, Jorhat, India.
  • Delivered an invited lecture entitled “Selective sensing of 1,2,4-trihydroxybenzene in the presence of its isomers using histidine-stabilized ZnS nanospheres” at North East Regional Seminar on Trends in Colloid and Interface Science, November 27-28, 2014, NEHU, Shillong, India.
  • Delivered an oral presentation entitled “Photocatalytic degradation of rhodamine B dye using histidine stabilized CdS quantum dots at International Conference on Nanoscience and Nanotechnology, March 18-20, 2013, SRM University, Kattankulathur, India.

Collaboration/Consultancy:  

Collaboration with Dr. L.R. Singh, Department of Nanotechnology, NEHU, Shillong.