Indian Scientists Develop Wearable Ammonia Gas Sensor 2026

By Vikas Sir, Founder & Senior Faculty – Cosmo Classes | 15 July 2026

Indian scientists developed a portable, self-powered and wearable ammonia sensing device on 14 July 2026. It was built at the Centre for Nano and Soft Matter Sciences (CeNS), Bengaluru, an autonomous institute under the Department of Science and Technology (DST), and detects ammonia at concentrations as low as 319 parts per billion (ppb).

Ammonia as an Industrial and Environmental Gas

Ammonia is a colourless gas with the formula NH₃. It is used in fertilisers, refrigeration and chemical manufacturing. High concentrations can affect the eyes, skin and respiratory system.

Working Principle of the Sensor

The sensor uses a hybrid vanadium oxide–vanadium sulfide (VOx/VS₂) heterostructure. A heterostructure joins two different functional layers and is used in sensors and optoelectronics. Crucially, the device operates at room temperature (~20–25°C), unlike many conventional sensors that need higher temperatures and energy.

Wearable and Flexible Platforms

Researchers fabricated flexible sensors on polymer, paper and textile substrates that work when bent, twisted or folded. Prototypes include smart bands, smart-home warning systems and e-textiles. A threshold-triggered monitor classifies ammonia into safe, warning and danger zones for instant alerts.

Important Facts for Exams

• CeNS: Autonomous institute under the Department of Science and Technology, Bengaluru.
• Published in: ACS Sensors (peer-reviewed journal).
• Unit: ppb (parts per billion) measures very low gas concentrations.
• Team lead: Prof. Angappane Subramanian.

Sensor Snapshot

Static GK on Gas Sensors

Gas sensors detect the presence or concentration of gases. Common types include metal-oxide, electrochemical, optical and nanomaterial-based sensors. Exam hint: Room-temperature, self-powered operation makes this sensor energy-efficient and wearable.

Practice Questions

Q1. The wearable ammonia sensor was developed at:
A) IISc
B) CeNS, Bengaluru
C) CSIR-NPL
D) IIT Madras
Answer: B

Q2. The chemical formula of ammonia is:
A) NO₂
B) NH₃
C) CH₄
D) CO₂
Answer: B

Q3. The sensor detects ammonia as low as:
A) 319 ppb
B) 319 ppm
C) 31.9 %
D) 3.19 ppb
Answer: A

Q4. CeNS is an autonomous institute under which department?
A) DBT
B) DST
C) DRDO
D) DAE
Answer: B

Q5. The sensor material is a heterostructure of:
A) MoS₂/WS₂
B) VOx/VS₂
C) TiO₂/SnO₂
D) ZnO/CuO
Answer: B

Q6. Consider the statements:
1. The sensor operates at room temperature.
2. It is fabricated on flexible substrates.
3. It classifies ammonia into safe, warning and danger zones.
Which are correct?
A) 1 and 2
B) 2 and 3
C) 1 and 3
D) 1, 2 and 3
Answer: D

UPSC / RPSC Relevance

• UPSC Prelims: DST institutes, nanomaterials, gas sensors.
• UPSC Mains – GS Paper III: Science & technology and indigenous innovation.
• RPSC / SSC: Science and technology current affairs.

Mains Descriptive Question

GS Paper III: "Wearable, room-temperature gas sensors can transform personal safety and environmental monitoring." Discuss with reference to the CeNS ammonia sensor. (250 words · 15 marks)