Confocal Laser Raman spectrometer

Make: Horiba Jobin Yovon, France

Model: Labram HR800 UV

Excitation sources: Green Laser @ 532 nm/50 mW & Red laser @ 633 nm/20 mW

Gratings:  600 l/mm for low resolution large scan range ( ≈15000 cm^-1) & 1800 l/mm for high resolution and scan range ( ≈ 6000 cm^-1)

Microscope Objective:

Normal WD: 10X, 20X, 50X, 100X (WD : 20,10.6,1.3,0.38, 0.21 mm respectively)

Long WD: 50X, 100X (WD: 10.6, 3.4 mm respectively)

• Imaging/Mapping:

XYZ mapping:

XY stage :X=75 mm and Y=50 mm , 1 µm repeatability

Step-by-step mode: step size (min) 50 nm

Z stage min step = 0.1 µm 

Duoscan Mode with scanning mirror.

Scanning/Averaging followed by Macro mapping for large area mapping

• Polarization dependent Raman Scattering :Range 400 – 700 nm
• Low Temp : Min 80K

Raman scattering is an inelastic scattering of incident light from vibrating atoms or molecules or from electronic states like plasmons, coupled plasmon-phonon states etc with change in the wavelength. It consists of Stokes and anti-Stokes components depending on whether the scattered wavelength is greater or less than the incident one. Thus Raman spectrum from a sample consists of several lines characteristic of the unique vibrational modes of the sample and has turned out to a fast and reliable non-destructive technique for characterization, material property studies under different sample environment.  However the Raman scattering efficiency is very poor and ≈ 10^-3 – 10^-5 times the elastically scattered Rayleigh component and requires a powerful excitation source. The excitation sources are generally UV/VIS/NIR CW laser sources with high incident photon flux and detection is by highly efficient CCDs. The change in the wavelength of the scattered radiation is analyzed using a single/multiple grating high resolution UV-visible-NIR optical spectrometer/spectrograph. The spectrometer should possess a very high rejection capability of the elastically scattered Rayleigh component from much weaker Raman scattered light. This is usually achieved by two or three stage spectrometers or more recently by single stage spectrometers with highly efficient Holographic Notch filters or sharp cutoff dielectric edge filters. 

List of Publications from within IIT Bombay:

• Singh K, Singh A. Effect of austempering temperature on corrosion evolution during immersion of high carbon nano structured bainitic steel in aqueous chloride environment. Materialia. 2022, 21:101282.
• Singh AK, Mandal KK, VS AA, Kumar A, Dixit S, Kumar A. Introducing ‘low cost large scale’hydrophobic SERS substrate. InNanoengineering: Fabrication, Properties, Optics, Thin Films, and Devices XVIII 2021 Vol. 11802, p. 1180206.
• Sahoo NR, Dixit S, Singh AK, Nam SH, Fang NX, Kumar A. High Temperature Mid‐IR Polarizer via Natural In‐Plane Hyperbolic Van der Waals Crystals. Advanced OpticalMaterials. 2022;10(4): 2101919.
• Mishra GK, Gautam M, Sau S, Mitra S. Surface Modified Lithium Cobalt Oxide (LiCoO 2 ) with Enhanced Performance at Higher Rates through Li Vacancy Ordering in the Monoclinic Phase. ACS Applied Energy Materials. 2021 Dec 1;4(12):14260 72.
• Pathak SS, Panchakarla LS. A large area flexible p type transparent conducting CuS ultrathin films generated at liquid liquid interface. Applied Materials Today. 2021; 24: 101152
• Panda S, Aditya MV, Tatiparti SS. Synergetic effect of C and Ni on hydrogen release from Mg Ni electrochemically synthesized reduced graphene oxide based hydride. Sustainable Energy & Fuels. 2021;5(17): 4414 24.
• Mehta JM, Jain NK, Chauhan DS, Prasad R, Kumawat MK, Dhanka M, Shanavas A, Srivastava R. Emissive radiodense stealth plasmonic nanohybrid as X ray contrast and photo ablative agent of cancer cells. Materials Today Communications. 2021 Jun 1; 27:102181.
• Mishra SK, Hole A, Reddy BP, Srivastava R, Chilakapati MK, De A. Raman micro spectroscopic map estimating in vivo precision of tumor ablative effect achieved by photothermal therapy procedure. Nanomedicine: Nanotechnology, Biology and Medicine. 2021 Oct 1;37:102437.
• Kumar R, Mukherji S. Photocatalysis of dichlorvos using graphene oxide TiO 2 nanocomposite under visible irradiation: process optimization using response surface methodology. Nanotechnology. 2021 Jul 16;32(40):405708.
• Amardeep A, Shende RC, Gandharapu P, Wani MS, Mukhopadhyay A. Faceted Antimony Particles with Interiors Reinforced with Reduced Graphene Oxide as High-Performance Anode Material for Sodium-Ion Batteries. ACS Applied Materials & Interfaces. 2022 Sep 29;14(40):45296-307.
• Barbhuiya NH, Misra U, Singh SP. Stacked Laser-Induced Graphene Joule Heaters for Desalination and Water Recycling. ACS Applied Nano Materials. 2022 Aug 1;5(8):10991-1002.

List of Publications from other University & College: 

• Rai S, Bhujel R, Biswas J, Swain BP. An eco friendly method for synthesis of Cu2O/ rGO /PANI composite using Citrus maxima juice for supercapacitor application. Journal of Materials Science: Materials in Electronics. 2021 Dec;32(23):27937 49.
• Rai S, Bhujel R, Mondal MK, Swain BP, Biswas J. Study of the Morphological, Optical, Structural and Electrical Properties of Silicon Nanowires at Varying Concentration of Catalyst Precursor. Materials Advances. 2022.
• Adsul , Tushar & Ghosh, Santanu & Varma, Atul. (2021). Allusions of raman spectroscopy on microstructural ordering and thermal maturity assessment of kerogen.
• Kumari M, Baraik N, Sarun PM. Effect of Nd doping on the structural, optical and dielectric properties of BaTi0. 95Sn0. 05O3 ceramics. Journal of Alloys and Compounds. 2021 Nov 25;883:160635.
• Kumari M, Yadav A, Sarun PM. Systematic investigation of structural, optical and dielectric properties of 0.5 mol% Eu: BaTiO3 ceramics. Materials Today: Proceedings. 2021 Jan 1;46:6102 6.
• Venkatasubbaiah R, Jha PK, Sanjay KR. Centella asiatica crop residue fabricated silver nanoparticles as potent antioxidant agents in photo catalytic degradation of hazardous dyes. Chemical Engineering Communications. 2021 May 26:1 9.
• Maulvi FA, Kanani PA, Jadav HJ, Desai BV, Desai DT, Patel HP, Shetty KH, Shah DO, Willcox MD. Timololeluting graphene oxide laden silicone contact lens: Control release profile with improved critical lens properties. Journal of Drug Delivery Science and Technology. 2022 Jan 25:103134.

• Samples can be solid in form of powder, thin film or bulk pallets. Solid samples should preferably not exceed size of 50 mm X 50 mm X 20 mm and not weigh more than 100 gms.
• Sample should be nontoxic and non radiactive.
• Liquid samples will be done in thin walled (< 0.5 mm and 2 mm OD ) glass/quartz capillary tubes. Users are required to bring samples in sealedcondition.

• Only online registration will be accepted. If you need to cancel your slot, send an email immediately to with an explanation. Else user will be blocked after two repeat ‘no show’
• Slots will be provided on a first-come first-served basis as far as possible.
• The slots are from 10.30–12.00, 12.00 – 13.30, 14.30- 16.00, 16.00 – 17.30 hrs. You can request two consecutive slots only once in a week. If your experiment needs more time (e.g. Mapping/Imaging.), please indicate area, mapping step, scan range (cm-1) and integration time so that we can deal with your specific requirement.
• USB drives are strictly forbidden for copying data to minimize virus-related issues. You need to bring a new blank CD to transfer your data. All data must be transferred within 7 days without exception.
• Users must be available throughout the course of data acquisition.

• Register online through the SAIF Website (www.rsic.iitb.ac.in)
• After the slot booking request is accepted, you will be informed by email about the date and time of your slot.
• For any queries please mail to lrs@iitb.ac.in