Cleanroom class, gases, vacuum, chilled water, vibration and electromagnetic interference decide whether a nano laboratory works. This covers the building side and the instrument classes together, and the order to buy them in.
Nanotechnology, the science and engineering of materials and devices at the 1 to 100 nanometre scale, is no longer confined to the world's top research universities. Bangladesh's leading institutions, including BUET, KUET, RUET, BAEC's nuclear research institutes and several private universities, are now establishing or expanding nano-fabrication and characterisation laboratories. The instruments are the part that gets specified. The room, the utilities and the safety systems are the part that decides whether those instruments ever reach their published specification, and they are the part that is expensive to fix after handover.
A functional nanotechnology research laboratory requires capabilities across four interconnected areas. The right investment sequence depends on the institution's research focus, whether that is materials science, semiconductor devices, biomedical nanotechnology, photonics or energy materials, but the four pillars remain the same:
| Pillar | What it covers | Key equipment | Lead manufacturers |
|---|---|---|---|
| Deposition | Creating thin films and nanostructures | Sputtering, CVD, ALD, evaporation | Oxford Instruments, Denton Vacuum, Moorfield Nanotechnology |
| Etching & Patterning | Removing material to define nanostructures | RIE, ICP-RIE, wet bench, lithography | Oxford Instruments, SUSS MicroTec |
| Characterisation | Measuring structure, composition, properties | SEM, TEM, AFM, Raman, XRD | Hitachi High-Tech, Renishaw, Oxford Instruments |
| Laser Processing | Precision cutting, ablation, annealing | Ultrafast lasers, laser micromachining | Coherent, Cemar Laser |
Cleanroom class is set by the smallest feature you intend to pattern, not by how the facility should look to a visitor. A characterisation laboratory with a sample preparation area needs cleanliness and stable conditions, not a classified cleanroom. Lithography is what forces the class up, because a particle comparable in size to the feature is a defect. A general guide is ISO Class 6 to 8 depending on lithography requirements, with the tighter class confined to the lithography bay rather than applied to the whole floor.
Two things drive Bangladeshi cleanroom cost more than the class itself. The first is dehumidification: conditioning outside air at Dhaka's dew point to cleanroom setpoint is the dominant load and the dominant running cost, and a design that treats it as an afterthought will either fail to hold humidity in monsoon or cost more to run than the department budgeted. The second is the gowning and discipline regime. A Class 6 room used without a change protocol performs like an ordinary room, and the capital is wasted.
Process utilities are usually the largest single gap between a specification written by an academic group and a facility that runs. Every plasma, deposition and etch tool arrives with a list of requirements that must exist before the crate is opened.
High-resolution electron microscopy and scanning probe microscopy are the most environmentally sensitive instruments a university will own, and both are routinely sited badly. Vibration comes from lift shafts, air handling plant, pumps, road traffic and the floor slab itself, and its effect at high magnification is an image that will not resolve regardless of the column. Ground floor, on grade, away from plant, is the default answer. Where it cannot be, budget an active isolation platform and get a site vibration survey before the order rather than after the complaint.
Electromagnetic interference is the failure mode that surprises people, because the room looks fine. Alternating magnetic fields from a nearby transformer, a busbar riser, a lift motor or an unbalanced three-phase cable run deflect the electron beam and produce distortion at exactly the magnifications you bought the instrument for. In a Bangladeshi building this deserves particular attention, because generator changeover and inverter-driven plant introduce fields that are intermittent and therefore hard to diagnose later. Survey the room for both vibration and field before signing for it, and hold the survey as part of the acceptance criteria.
A nano laboratory holds toxic, pyrophoric, corrosive and flammable gases in the same building as students. The safety case has three parts that must be designed together, and buying one without the others produces a facility that is unsafe in a way nobody notices until an incident.
Those three appear in the nano catalogue as a single group of forty five items covering cleanroom gas safety and generation, and they should appear in the project budget as a single line rather than as three afterthoughts attached to three different tools.
The nano-fabrication catalogue Vvon supplies in Bangladesh now runs to 1,019 products from 23 manufacturers, and it is more useful to think in equipment classes than in brand names when planning a facility. The classes, roughly in order of how many laboratories need them:
Within that, three manufacturers anchor most Bangladeshi facility plans. Oxford Instruments (UK) produces, through its Plasma Technology division, the RIE, ICP-RIE and PECVD systems most widely cited in academic literature, on the PlasmaPro 100 platform and its Cobra ICP variant, together with Atomfab for atomic layer deposition and Ionfab for ion beam etch and deposition. Its cryogenics business is no longer part of the company, so cryostats and temperature control come from Lake Shore rather than from Oxford. Renishaw (UK) manufactures the inVia and Qontor Raman platforms, used to characterise carbon nanomaterials such as graphene, carbon nanotubes and fullerenes, semiconductor thin films, polymers and biological samples at the nanoscale. Raman is non-destructive, requires no sample preparation and combines with optical microscopy for spatially resolved chemical mapping, which is why an inVia is typically the first characterisation instrument bought after an SEM. Coherent (USA), formed by the merger of II-VI and the original Coherent, supplies the ultrafast femtosecond and picosecond sources used for nano-ablation and surface structuring, the continuous and pulsed DPSS sources used for Raman excitation and optical trapping, and the excimer sources used for UV lithography and thin-film annealing.
For a Bangladeshi institution building a nano lab from scratch, the recommended investment sequence depends on research focus, but a general framework holds:
Renishaw also manufactures the laser interferometers, multi axis and rotary axis calibrators, ballbars, alignment lasers and optical encoder systems used for precision metrology, which are relevant to institutions with mechanical engineering or precision manufacturing research programmes and are often a better first purchase than a second characterisation instrument.
Facilities rarely fail at commissioning. They fail eighteen months later, and the causes repeat. Nobody is employed to run the laboratory, so booking, training and maintenance fall to a postdoc who then leaves. The service contract was not renewed because it sat in a capital budget that closed. Process gas ran out and the reorder lead time was six weeks. The chilled water loop was never maintained and a plasma tool has been down since the pump failed. The humidity control was switched off at night to save electricity and the optics grew a haze. And spare parts that were assumed to be available locally turn out to have a three-month import lead time nobody tested.
Every one of those is a line in an operating budget written before the equipment lands, which is why the running cost plan matters more to a facility's survival than the choice between two comparable instruments.