# Direct monitoring of individual ammonia or volatile fatty acids using a temperature-controlled galvanic sensor chip

https://mdr.nims.go.jp/datasets/185e0753-de99-4c3f-b83c-cf1164055a81

## Files

- [Manuscript 20250410 (unmarked).docx](https://mdr.nims.go.jp/filesets/1c9daf08-e861-4991-bbc0-5bc5b33e66ac/download) ([Detail](https://mdr.nims.go.jp/filesets/1c9daf08-e861-4991-bbc0-5bc5b33e66ac.md))

## Id

185e0753-de99-4c3f-b83c-cf1164055a81

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-07-09T23:06:05.371636Z

## Updated at

2025-07-10T23:30:37.837238Z

## Published at

2025-07-10T23:16:38.556434Z

## Doi

https://doi.org/10.48505/nims.5574

## First published url

https://doi.org/10.1016/j.snb.2025.138077

## Date published

2025-06-01

## Recorded date published

2025-11

## Resource type

journal_article

## Manuscript type

authors_original

## Collection



## Title

- title: Direct monitoring of individual ammonia or volatile fatty acids using a temperature-controlled
    galvanic sensor chip
  title_type: original
  lang: en

## Description

- description: "The detection of ammonia (NH3) and volatile fatty acids (VFAs) during
    anaerobic\r\nprocesses plays an important role in the management of livestock
    and their waste, as well as\r\nin biogas production. A newly developed moisture
    sensor chip (MSC) was used to monitor\r\nthese gasses volatized from aqueous solutions.
    The concentrations of NH3, acetic acid (AA),\r\npropionic acid (PA), and butyric
    acid (BA) were in the range 60–150 mM. To substantially\r\nimprove the detection
    sensitivity, MSC was cooled from 24 to 19 °C. Because the\r\ntemperature was decreased,
    volatized water and solute condensed on the surface of the MSC\r\nand the formed
    microdroplets and the detection current increased to several thousand\r\npicoamperes.
    The detection current also increased with increasing concentration of VFAs\r\nand
    was highly sensitive to the pH conditions and the partial pressure of VFAs in
    the air\r\nphase. The applicable concentration range was from 0 to 150 mM for
    NH3 and from 60 to\r\n150 mM for VFAs. The highest sensor sensitivity to NH3 was
    12.3 mM-1 at 22 °C. The\r\nhighest sensor sensitivity for AA among VFAs was 4.0
    mM-1 at 19 °C. The amount of water\r\ndroplets formed on the surface of MSC increased
    with increasing pH of the aqueous solution\r\nin the order NH3>water>VFAs. Droplet
    formation preferentially occurred in the order\r\nAA>PA>BA, indicating that a
    shorter alkyl chain of VFA was preferred. The proposed\r\ntemperature-controlled
    MSC is applicable for the detection of NH3 under basic conditions\r\nand for the
    detection of VFAs under acidic conditions."
  description_type: abstract
  lang: und

## Creator

- name: Farahdiana Wan Yunus
  role: author
  orcid: https://orcid.org/0000-0003-2406-4247
  organization: National Institute for Materials Science
- name: Moataz Mekawy
  role: author
  organization: National Institute for Materials Science
- name: Edhuan Ismail
  role: author
  orcid: https://orcid.org/0000-0003-1031-6562
  organization: National Institute for Materials Science
- name: Jin Kawakita
  role: author
  orcid: https://orcid.org/0000-0002-4821-4150
  organization: National Institute for Materials Science
- name: Izumi Ichinose
  role: author
  orcid: https://orcid.org/0000-0002-2236-0942
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: VFA sensor
  schema: not_defined

## Rights

- identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: SENSORS AND ACTUATORS B-CHEMICAL
  issn: '09254005'
  volume: '442'
  article_number: '138077'

## Conference



## Related item



## Funding

- identifier: 22H02149
  funder_name: Japan Society for the Promotion of Science
- identifier: JPJ009237
  funder_name: Japan Science and Technology Agency Moonshot Research and Development
    Program

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: 1c9daf08-e861-4991-bbc0-5bc5b33e66ac
  filename: Manuscript 20250410 (unmarked).docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 14588929
  md5: 00165a27076cb9312bc1de381eef9bdb

## Thumbnail

fileset_id: 1c9daf08-e861-4991-bbc0-5bc5b33e66ac
filename: Manuscript 20250410 (unmarked).docx